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Kamen Rider Den-O (仮面ライダー電王) is a Japanese tokusatsu series that serves as the 17th installment in the Kamen Rider franchise and the eighth entry in the Heisei era.

Ryotaro Nogami
Ryotaro Nogami (野上 良太郎) is an optimistic yet unlucky young man who becomes Kamen Rider Den-O after picking up a Rider Pass (ライダーパス) and being convinced by Hana to help mankind. Over the course of the series, he discovers he is a Singularity Point (特異点), an individual who can overpower Imagin attempting to possess him, exist outside of time, and is largely immune to timeline changes. Additionally, he forms bonds with Imagin who disagree with their kind's methods and allow him to assume stronger forms.

Ryotaro utilizes the Den-O Belt (デンオウベルト) in conjunction with a Rider Pass to transform into Kamen Rider Den-O Plat Form (プラットフォーム), which arms him with the DenGasher (デンガッシャー), a multi-purpose weapon that can be reconfigured into varying forms. Due to his lack of combat prowess and Plat Form's lack of offensive abilities, he initially allows his Imagin partners to possess him and assume combat-oriented forms tailored to their fighting styles. Later in the series, Ryotaro acquires the Climax Cellphone K-Taros (クライマックス携帯 ケータロス), which allows him to fuse with all of his Imagin partners to assume Climax Form (クライマックスフォーム), and the DenKamen Sword (デンカメンソード), which allows him to channel his Imagin's powers and can combine with a Rider Pass to assume Liner Form (ライナーフォーム).

During the events of the film Saraba Kamen Rider Den-O: Final Countdown, Ryotaro is possessed by the Ghost Imagin, who forces him to use the Yuuki Belt in conjunction with a Rider Pass to transform into Kamen Rider Yuuki Skull Form (スカルフォーム). While transformed, he wields the Ghost Imagin's sword and can perform the Terminate Flash (ターミネイトフラッシュ) finisher.

Ryotaro is portrayed by Takeru Satoh (佐藤 健).

Kotaro
"Kotaro" (小太郎), as named by Hana, is Ryotaro's 11-year-old self who appears exclusively in the film Kamen Rider Den-O: I'm Born!. While living with his grandmother, he occasionally snuck out to cope with losing his parents. During one such excursion, he encounters the DenLiner crew amidst their efforts to stop Gaoh and ends up being possessed by Momotaros, who uses him to transform into a smaller version of Kamen Rider Den-O called "Kamen Rider Mini Den-O" (仮面ライダーミニ電王) to fight Gaoh's forces due to the present Ryotaro's memory loss voiding their contract. Following the battle, the DenLiner crew take Kotaro to see his parents during his birth before returning him to his proper time period.

Kotaro is portrayed by Takuya Mizoguchi (溝口 琢矢), who also portrays the de-aged Ryotaro in the Cho Den-O film trilogy.

Hana / Kohana
Hana (ハナ) is a Singularity Point, passenger of the DenLiner, daughter of Airi Nogami and Yuto Sakurai, and niece of Ryotaro Nogami who originates from a future that the Imagin destroyed. As the sole survivor, she vowed revenge on the Imagin and joined the DenLiner's crew to protect the timeline from them. In pursuit of this goal, she convinces Ryotaro to become Kamen Rider Den-O and often serves as an enforcer to keep his Imagin partners in line, though she eventually comes to see them in a better light. As her future is gradually recreated, Hana physically regresses to her childhood self and assumes the alias of Kohana (コハナ), though she stays on the DenLiner and later becomes a member of the DenLiner Police to continue protecting the timeline.

Hana is portrayed by Yuriko Shiratori (白鳥 百合子) while Kohana is portrayed by Tamaki Matsumoto (松元 環季).

Momotaros
Momotaros (モモタロス) is a hot-headed and arrogant yet comedic Oni/namesake-themed Imagin who is more interested in fighting than helping other Imagin. After initially failing to possess Ryotaro, Momotaros reluctantly joins the DenLiner crew and forms a contract with and fights alongside him. In time, Momotaros becomes the self-proclaimed leader of Ryotaro's additional Imagin partners. The team would eventually become the DenLiner Police (デンライナーポリス) to keep rogue Imagin in check and eventually represent Den-O as a whole in succeeding media in light of Ryotaro's absence.

As Kamen Rider Den-O, Momotaros assumes Sword Form (ソードフォーム), wielding the DenGasher in its sword configuration, possesses primary control over Climax Form, and can channel his power through the DenKamen Sword's MomoSword (モモソード) mode.

During the events of the films OOO, Den-O, All Riders: Let's Go Kamen Riders and Kamen Rider × Super Sentai: Ultra Super Hero Taisen, Momotaros gains the ability to turn into the Momotaken sword for Kamen Rider New Den-O's use and the pink-colored Momorider (モモライダー), a hybrid of Momorenger and the Double Riders, respectively.

Momotaros is voiced by Toshihiko Seki (関 俊彦).

Urataros
Urataros (ウラタロス) is a suave, charming yet deceitful sea turtle/Urashima Tarō-themed Imagin who encounters Ryotaro after possessing him to use his status as a Singularity Point to pursue personal freedoms. Despite his personality, the latter allows the Imagin to stay after sensing he has a good heart.

On his own, Urataros wields the Uratarod (ウラタロッド) and possesses fishing skills. As Kamen Rider Den-O, he assumes Rod Form (ロッドフォーム), controls Climax Form's right arm, and can channel his power through the DenKamen Sword's UraRod (ウラロッド) mode.

Urataros is voiced by Kōji Yusa (遊佐 浩二).

Kintaros
Kintaros (キンタロス) is a noble bear/namesake-themed Imagin with a sumo wrestler-like personality and fighting style who displays an obsession with making his opponents "cry" (泣けるで).

On his own, Kintaros wields the Kintaros Axe (キンタロスアックス) and possesses the most strength of Ryotaro's Imagin partners. As Kamen Rider Den-O, Kintaros assumes Axe Form (アックスフォーム), controls Climax Form's left arm, and can channel his power through the DenKamen Sword's KinAxe (キンアックス) mode.

Kintaros is voiced by Masaki Terasoma (てらそま まさき).

Ryutaros
Ryutaros (リュウタロス) is a childish dragon/Taro the Dragon Boy-themed Imagin and a former member of Kai's gang who displays a love of breakdancing and animals. Having laid dormant in Ryotaro until he is awakened by Issē Miura's counseling, Ryutaros initially seeks to take over the DenLiner and kill Ryotaro as part of a deal with Kai. However, the Imagin develops a crush on Airi Nogami, abandons his plans, and joins the DenLiner's crew.

On his own, Ryutaros wields the Ryuvolver (リュウボルバー) gun and possesses questionable marksmanship. As Kamen Rider Den-O, he assumes Gun Form (ガンフォーム), wields the DenGasher in its Gun Mode (ガンモード), controls Climax Form's legs, and can channel his power through the DenKamen Sword's RyuGun (リュウガン) mode.

Ryutaros is voiced by Kenichi Suzumura (鈴村 健一).

Yuto Sakurai
Yuto Sakurai (桜井 侑斗) is a spoiled, immature, and wrathful former high school student who was recruited by his future self to become Kamen Rider Zeronos (仮面ライダーゼロノス) and utilize the ZeroLiner (ゼロライナー) steam locomotive to protect the timeline from rogue Imagin, though memories of him across the timeline are erased every time he uses his Rider powers. Taking his mission seriously, Sakurai abuses his Imagin partner Deneb and initially sees Ryotaro Nogami as being unfit to be a Kamen Rider because of the latter's desire to protect people and for refusing to use dishonest methods. However, Sakurai eventually warms up to him and takes on some of his traits.

Utilizing the Zeronos Belt (ゼロノスベルト) and a green Zeronos Card (ゼロノスカード), Sakurai can transform into Kamen Rider Zeronos Altair Form (アルタイルフォーム). While transformed, he wields the ZeroGasher (ゼロガッシャー), a multi-purpose weapon that can switch between Saber Mode (サーベルモード) and Bowgun Mode (ボウガンモード). With a red Zeronos Card, he can assume Zero Form (ゼロフォーム).

During the events of the web-exclusive series Kamen Rider Outsiders, an alternate universe Sakurai from a world where he lost his loved ones and was involved an undisclosed disaster that he failed to overcome accepts Zein's offer to eradicate malice and obtains the Zein Driver (ゼインドライバー) belt and its corresponding Progrise Key from Sakuya Tachibana and George Karizaki, which allow him to transform into Kamen Rider Zein (仮面ライダーゼイン).

Yuto Sakurai is portrayed by Yuichi Nakamura (中村 優一).

Yu
"Yu" (ユウ) is the nickname of Yuto's 11-year-old self who appears exclusively in the Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship. Having lost his mother to an unspecified disease and his father going away for a business trip, Yu is forced to move in with his grandmother in the countryside, where he has trouble making friends. As a result of the Oni clan attempting to alter the present by rewriting the Momotarō folktale, Yu gets caught in the middle of the conflict between them and the DenLiner crew as he possessed the Trump Stone (切り札の石), an artifact passed down by his mother's ancestors that the Oni clan seek for their plot. In order to recover Yuto from the time distortion and help fight the Oni clan, Yu forms a contract with Deneb and eventually finds his courage once he is returned to his original time.

Yu is portrayed by Ruka Sawaki (沢木 ルカ).

Deneb
Deneb (デネブ) is a polite and loyal yet over-apologetic crow/Benkei-themed Imagin partnered with Yuto Sakurai who serves as his butler, parental figure, and combat aide. Despite being abused by Sakurai, Deneb stays with him out of loyalty to the former's future self.

While possessing Sakurai and using a yellow Zeronos Card, Deneb can transform into Kamen Rider Zeronos Vega Form (ベガフォーム) and turn into the Denebick Buster (デネビックバスター) gun for Sakurai's use in Zero Form.

Deneb is voiced by Hōchū Ōtsuka (大塚 芳忠).

Airi Nogami
Airi Nogami (野上 愛理) is Ryotaro's older sister and owner of the Milk Dipper (ミルクディッパー) library/café, which previously belonged to their parents, who serves as a motherly figure to him, and the object of several young men's affections, though she remains oblivious to their advances. She was originally meant to marry Yuto Sakurai prior to the series, having becoming pregnant with Hana, but Sakurai was forced to erase himself and their child from Airi's memories to protect her from Kai. Nonetheless, she retains trace amounts of her time with him, which manifests as a feeling that something is missing. By the series finale, she regains her memories of him.

Airi is portrayed by Wakana Matsumoto (松本 若菜).

Seigi Ozaki
Seigi Ozaki (尾崎 正義) is a journalist, chief editor of a short-lived magazine, and a regular at the Milk Dipper who seeks to restore the magazine. While he primarily seeks Airi's affections, he has flirted with other women since childhood.

Seigi Ozaki is portrayed by Akira Nagata (永田 彬).

Issē Miura
Issē Miura (三浦 イッセー) is an introverted and self-styled "super counselor" and a regular at the Milk Dipper who also vies for Airi's affections.

Issē Miura is portrayed by Ryo Ueno (上野 亮).

Naomi
Naomi (ナオミ) is the hyperactive and perky yet level-headed waitress of the DenLiner's dining car who, despite her best efforts, often makes coffee that tastes terrible to humans, but is irresistible to Imagin.

Naomi is portrayed by Rina Akiyama (秋山 莉奈).

Owner
The serious yet eccentric Owner (オーナー) of the time-traveling DenLiner (デンライナー) bullet train is a Singularity Point who is knowledgeable in the timeline's inner workings, speaks in complex riddles when discussing its nature, and displays zero tolerance for those who fight on the DenLiner and violate the flow of time. He is also known for eating dishes, usually rice or flan, adorned with a flag, and attempting to finish the meal without knocking the flag over as part of a rivalry he shares with the Station Master. During the events of the film Kamen Rider Den-O & Kiva: Climax Deka, the Owner establishes the DenLiner Police, names himself its Chief Inspector, and takes up a DenGasher modified to shoot tranquilizer flags.

The Owner is portrayed by Kenjirō Ishimaru (石丸 謙二郎), who also portrays the Station Master.

Past Man
The "Past Man" (過去の男) is Yuto Sakurai's mysterious future self and Hana's father who investigates the Imagin's activities. He was originally set to marry Airi Nogami until Kai's plans forced him to erase himself from the timeline to protect her and Hana, go into hiding to stop him, and recruit his younger self to assist further.

The Past Man is portrayed by Tomonobu Okano (岡野 友信).

Sieg
Sieg (ジーク) is a princely yet superior-minded and easily agitated swan/Swan Lake-themed Imagin and unofficial member of Ryotaro Nogami's group. Six months prior to the latter becoming Kamen Rider Den-O, Sieg intended to form a contract with a pregnant woman named Shiori Takayama, but was trapped within a deep sleep by her baby, Yusuke. After Yusuke is born, Sieg emerges with no memory of what happened and left gradually deteriorating due to the baby not having enough memory to maintain his existence. Sieg possesses Ryotaro to save himself before realizing he successfully formed a contract with Shiori, who wished for Yusuke to be safe. Having fulfilled the contract, he stays behind on the date of her fondest memory, her wedding day, but occasionally returns to aid the DenLiner crew.

While possessing Ryotaro and eventually on his own, Sieg can transform into Kamen Rider Den-O Wing Form (ウイングフォーム). While transformed, he wields the DenGasher in its Hand Ax Mode (ハンドアックスモード) and Boomerang Mode (ブーメランモード). Additionally, he can fuse with Ryotaro and the Taros Imagin to assume Kamen Rider Den-O Super Climax Form (超･クライマックスフォー).

Sieg is voiced by Shin-ichiro Miki (三木 眞一郎).

Gaoh
Gaoh (牙王) is a thief-king who became disillusioned with the idea of time and seeks to take over the space-time continuum via the power of the GaohLiner (ガオウライナー), a legendary crocodile-themed time train formerly known as God's Train (神の列車) that was created by an ancient civilization to erase Singularity Points before it was sealed for fear of its power. Throughout episodes 25 through 28 of the series and the film Kamen Rider Den-O: I'm Born!, Gaoh leads an army of Imagin in establishing a camp in May 2000 and sending Mole Imagin to 2007 to lure the DenLiner crew into a trap so he can steal the DenLiner itself and use the Owner's Master Pass to travel to the Sengoku era. From there, he manipulates Yukimura Sanada into opening the cave where the GaohLiner was sealed before using it to reach 1988 with the intention of killing Ryotaro Nogami before he is born, only to be foiled by Kamen Rider Zeronos and four versions of Kamen Rider Den-O from across the timeline and turned to dust while the GaohLiner is destroyed by the DenLiner and ZeroLiner.

Utilizing the Gaoh Belt (ガオウベルト) in conjunction with the Master Pass (マスターパス), Gaoh can transform into Kamen Rider Gaoh (仮面ライダーガオウ（牙王）). While transformed, he wields the GaohGasher (ガオウガッシャー) in its serrated blade mode, which he can use to perform the Tyrant Crash (タイラントクラッシュ) finisher.

Gaoh is portrayed by Hiroyuki Watanabe (渡辺 裕之).

Station Master
The Station Master (駅長) is the Owner's effeminate rival who physically resembles him, though they claim it is simply others' imagination.

The Station Master is portrayed by Kenjirō Ishimaru, who also portrays the Owner.

Kai
Kai (カイ) is a Singularity Point from the future and the leader of an army of Imagin who possesses psychic powers, such as telepathy and mind control, and the ability to open time portals who seeks to save the Imagin's time by killing a special human called the "Junction Point". In pursuit of his goal, he sends Imagin to wreak havoc across the timeline in search of them. Initially believing it is Yuto Sakurai's future self, Kai attempts to kill him before shifting his attention to Kamen Rider Den-O. He eventually discovers Hana is his target, but is ultimately killed by Kamen Rider Den-O and his allies, causing him to dissolve into sand and take several Imagin with him.

Kai is portrayed by Hideo Ishiguro (石黒 英雄).

Guest characters

 * Imagin (イマジン): Sand-based monsters from a possible future who lost their physical forms after their timeline was erased. Now dependent on memories to survive, they possess humans to form a contract with them and assume physical forms based on key fictional characters from their memories. Due to their physiology, some Imagin possess the ability to create clones of themselves with minor physical and mental differences. Additionally, Imagin have the potential to spawn one or several giant, feral monsters called Gigandeaths (ギガンデス), which are divided between three sub-species: the bird-like Gigandeath Heaven (ギガンデスヘブン), the eel-like Gigandeath Hades (ギガンデスハデス), and the behemoth-like Gigandeath Hell (ギガンデスヘル). The majority of Imagin join Kai in traveling to the year 2007 to find weak-willed humans, form contracts by granting their wishes, and use their host's memories to travel back through their personal timelines to find and kill a special Singularity Point called the "Junction Point" (分岐点の鍵) to restore their time. Being individuals with unique personalities and quirks, several Imagin choose to act independently of Kai or with other individuals.
 * Bat Imagin (バットイマジン) A namesake/"The Bat, the Birds, and the Beasts"-themed Imagin that can produce sonic blasts and possesses arm wings that allow him to create powerful gusts. After forming a contract with a young man named Tetsuo (哲男) to retrieve the latter's keychain, the monster attacks and kill anyone who possesses a matching keychain. Upon fulfilling the contract, the Bat Imagin travels back in time to 2004 and possesses Tetsuo's past self to wreak havoc, but he is killed by Kamen Rider Den-O Sword Form. The Bat Imagin is voiced by Kiyoyuki Yanada (梁田 清之).
 * Chameleon Imagin (カメレオンイマジン): A namesake/"The Frog Prince"-themed Imagin that can breathe fire and wields a whip. After forming a contract with Yū Yamagoshi (山越 佑), who desires money, the monster robs banks for him. Upon fulfilling the contract, he travels back in time to 2006, but is killed by Kamen Rider Den-O Sword Form. The Chameleon Imagin is voiced by Jun'ichi Kanemaru (金丸 淳一).
 * Crust Imagin (クラストイマジン): A crustacean/"The Crab and the Monkey"-themed Imagin who possesses seaweed-like tendrils and wields a boomerang sword. After forming a contract with Daiki Saitō (斉藤大輝), who wants to rejoin his soccer team, the monster attacks and hospitalizes the other members. Upon fulfilling the contract, the Crust Imagin travels back in time to 2006 to destroy the soccer stadium, only to be foiled and killed by Kamen Rider Den-O Rod Form. The Crust Imagin is voiced by Kyousei Tsukui (津久井 教生).
 * Crow Imagin (クロウイマジン): A namesake/"The Bird in Borrowed Feathers"-themed Imagin who wields a cane and possesses feathers that double as explosive shuriken. After forming a contract with Yumi Saitō (斉藤優美), who wishes to forget about her ex-boyfriend Toyama, the monster destroys anything playing "Four Seasons Concerto No. 1: Spring" and travels back in time to 2006 to kill everyone who attended Yumi and Toyama's wedding until he is defeated by Kamen Rider Den-O Rod and Sword Form. The Crow Imagin is voiced by Rintarō Nishi (西 凛太朗).
 * Rhino Imagin (ライノイマジン): A namesake/"The Naked Rhinoceros"-themed Imagin who possesses superhuman strength and a mace capable of firing energy blasts. After forming a contract with Shinji Kikuchi (菊池信司), who wishes to become a karate master, the monster attacks his rivals. Upon fulfilling the contract, the Rhino Imagin travels back in time to 2006 to destroy a karate arena, only to be foiled and killed by Kamen Rider Den-O Axe Form. The Rhino Imagin is voiced by Tsuyoshi Koyama (小山 剛志).
 * Ivy Imagin (アイビーイマジン): A namesake/"Jack and the Beanstalk"-themed Imagin who can fire energy beams from his fingers, possesses vine-like tendrils, and wields a double-edged sword. After forming a contract with Kensaku Kobayashi (小林謙作), who wants to be with his daughter Kasumi, the monster sabotages her career and travels back in time to 2006 to destroy Kensaku's hometown until the monster is destroyed by Kamen Rider Den-O Axe Form. Following the battle, a time distortion caused by it undoes the monster's damage. The Ivy Imagin is voiced by Keiichi Sonobe (園部 啓一).
 * Owl Imagin (オウルイマジン): A namesake/"The Owl and the Birds"-themed Imagin who can fly and wields feather bombs. After forming a contract with Shūji Toyama (戸山秀二), who wishes for the park he works at to be a better place for the stray animals that live there, the monster attacks any humans who step foot in the park before using cars to barricade the park. Upon fulfilling the contract, the Owl Imagin travels back in time to 1997 to wreak havoc, only to be killed by Kamen Rider Den-O Gun Form. The Owl Imagin is voiced by Takaya Kuroda (黒田崇矢).
 * Whale Imagin (ホエールイマジン): A namesake/The Adventures of Pinocchio-themed Imagin subspecies that specialize in underwater combat and can fire streams of water from their mouths. In episodes 15 and 16, a staff-wielding instance forms a contract with Kōsaku Higuchi (火口耕作), who wishes to absolve himself of his drinking addiction, and attacks anyone who knows of it. Upon fulfilling the contract, the Whale Imagin travels back in time to 2004 to attack partygoers until he is killed by Kamen Rider Den-O Sword Form. In the series finale, a sword-wielding instance appears as a member of Kai's army. The Whale Imagin is voiced by Yōhei Tadano (多田野 曜平).
 * Wolf Imagin (ウルフイマジン): A namesake/Big Bad Wolf-themed Imagin armed with a sword capable of firing crescent-shaped energy beams. In the series, one hot-tempered instance forms a contract with Yuka Sawada (沢田 由香), who wishes to relive her high school days, by vaporizing school girls and giving their possessions to her. Upon fulfilling the contract, the Wolf Imagin travels back in time to 2004, but is thwarted and killed by Kamen Rider Den-O Sword Form. Additional instances of the Wolf Imagin also appear in the Hyper Battle DVD special Kamen Rider Den-O: Singing, Dancing, Great Training!! and the Imagin Anime shorts. The Wolf Imagin is voiced by Nobuyuki Hiyama (檜山 修之).
 * Jelly Imagin (ジェリーイマジン): A jellyfish/"The Jellyfish Errand"-themed Imagin who possesses tentacles, electrokinesis, and the ability to liquefy himself. After forming a contract with Kōhei Amano (天野晃平), who wishes to unearth a time capsule his deceased girlfriend Haruka buried, the monster forces him to unearth any time capsule he sees being buried. Upon fulfilling the contract, the Jelly Imagin travels back in time to 2006 and attacks a group of picnickers near the site where Haruka buried her time capsule and overpowers Kamen Rider Den-O Sword Form until he is killed by Kamen Rider Zeronos Vega Form. The Jelly Imagin is voiced by Ryūsei Nakao (中尾 隆聖).
 * Tortoise Imagin (トータスイマジン): A two-in-one namesake/"The Tortoise and the Hare"-themed Imagin consisting of the Tortoise Imagin Turtle (トータスイマジン カメ), the serious-minded primary body who possesses a durable hide and the ability to fire pellets from his mouth; and the Tortoise Imagin Rabbit (トータスイマジン ウサギ), an energetic yet childish hare-themed offshoot who resides within the primary body. After initially failing to make a contract with Tanaka (田中), who made an unspecified wish while he was half-asleep, the Tortoise Imagin eventually travels back in time to 2006 before he is killed by Kamen Riders Zeronos Altair Form and Den-O Rod Form. The Tortoise Imagin is voiced by Kōji Ochiai (落合 弘治).
 * Scorpion Imagin (スコーピオンイマジン): A namesake/"The Boy Hunting Locusts"-themed Imagin who wields an axe and a stinger-like hand capable of firing energy needles. After forming a contract with Akio Masuda (増田明男), who kidnapped Shiori Takayama's baby Yusuke and wished to find her, the Scorpion Imagin kidnaps her. Upon fulfilling the contract, the monster travels back in time to 2002, but is killed by Kamen Rider Den-O Rod and Axe Form. The Scorpion Imagin is voiced by Nobutoshi Canna (神奈 延年).
 * Spider Imagin (スパイダーイマジン): A namesake/tsuchigumo-themed Imagin sub-species. After forming a contract with Masashi Aoki (青木雅史), who wants to help his sister Mayu see the stars, one instance kidnaps and ties her to a radio tower, but is killed by Kamen Rider Zeronos Altair Form. Nonetheless, it produces a clone at the last minute, who goes on to resume the contract by causing a blackout before it is killed by a future version of Kamen Rider Zeronos Altair Form and Kamen Rider Den-O Gun Form. Additional instances of the Spider Imagin also appear in the Hyper Battle DVD special Kamen Rider Den-O: Singing, Dancing, Great Training!! and Episode Yellow of the Cho-Den-O film trilogy. The Spider Imagin is voiced by Chihiro Suzuki (鈴木千尋) in the series and Akira Sasanuma in Episode Yellow.
 * Wasp Imagin (ワスプイマジン): A namesake/"The Wasp and the Snake"-themed Imagin sub-species who possess the ability to fire needles from their foreheads and wield rapiers. After forming a contract with a criminal named Machida (町田), who wishes to have his criminal record expunged, one instance of the Wasp Imagin travels back in time to 2005, only to be killed by Kamen Rider Den-O Climax Form. An additional instance of the Wasp Imagin also appears in the series finale as a member of Kai's army. The Wasp Imagin is voiced by Shōto Kashii (樫井 笙人).
 * Bluebird Imagin (ブルーバードイマジン): A namesake/"The Blue Bird"-themed Imagin sub-species who possess similar abilities as the Owl Imagin and the additional ability to produce fireworks. After forming a contract with Tooru Terasaki (寺崎トオル), who wishes for his wife to see fireworks, one instance of the Bluebird Imagin uses his powers on her, only to be thwarted by Kamen Rider Zeronos and Deneb. Upon completing the contract, he travels back in time to 2002, only to be killed by Kamen Rider Den-O Climax Form. An additional instance of the Bluebird Imagin also appears in the series finale as a member of Kai's army. The Bluebird Imagin is voiced by Mitsuaki Hoshino (星野 充昭).
 * Rabbit Imagin (ラビットイマジン): A namesake/"The Tortoise and the Hare"-themed Imagin with a twisted sense of humor who wields a pair of sickles. After forming a contract with an unnamed man, who wishes to fly, the Rabbit Imagin obliges by threatening to drop him from a great height. Upon fulfilling the contract, the former travels back in time to 2004, but is killed by Kamen Rider Den-O Axe Form. The Rabbit Imagin is voiced by Toshitsugu Takashina (高階 俊嗣).
 * Anthopper Imagin (アントホッパーイマジン): A pair of ant/grasshopper/"The Ant and the Grasshopper"-themed Imagin brothers consisting of the level-headed Ari, who wields a shovel-like sword, and the maniacal Kirigiris, who wields a viola-like sword. Working independently of Kai, they seek to kill Kamen Rider Den-O for themselves. In pursuit of this goal, they align themselves with bank manager Yuya Fujishiro (藤代裕也), but are killed by Kamen Riders Den-O Climax Form and Zeronos Altair Form. An additional instance of Ari also appears in the Hyper Battle DVD special Kamen Rider Den-O: Singing, Dancing, Great Training!!. Ari and Kirigiris are voiced by Kohsuke Toriumi (鳥海 浩輔) and Tomokazu Seki (関 智一) respectively.
 * Kraken Imagin (クラーケンイマジン): A namesake-themed Imagin who possesses a hand gun and tentacles for a left hand. After forming a contract with an unnamed pianist, who wishes for a piano, the Kraken Imagin fulfills the request and travels back in time to 2004, only to be killed by Kamen Rider Den-O Rod Form. The Kraken Imagin is voiced by Tetsu Inada (稲田 徹).
 * Mole Imagin (モールイマジン): A namesake/"Thumbelina"-themed Imagin sub-species capable of cloning themselves, with the differing offshoots possessing either axes, claws, or drills for hands. One group of Mole Imagin form a contract with Yamaguchi (山口) and travel back in time to 2000, but are killed by Kamen Riders Zeronos Zero Form and Den-O Liner Form. In the series finale, New Mole Imagin (NEWモールイマジン) armed with varying weapons serve in Kai's army. The Mole Imagin are voiced by Daisuke Kirii (桐井 大介), Kōichi Sakaguchi (坂口 候一), and Akira Sasanuma (笹沼 尭羅).
 * Leo Imagin (レオイマジン): A lion/"The Coward and the Lion of Gold" (金のライオンを見つけた男)-themed Imagin and one of Kai's enforcers who commands Leo Soldiers (レオソルジャー Reo Sorujā) and possesses powerful claws on his right hand. The Leo Imagin initially tries to kill Ryutaros before Kai orders him to travel back in time to 2006, only to be killed by Kamen Rider Den-O Liner Form. The Leo Imagin is voiced by Kazuhiro Yamaji (山路 和弘).
 * Panda Rabbit Imagin (パンダラビットイマジン): A giant panda/rabbit/"The Tortoise and the Hare"-themed Imagin who wields a sword. After forming a contract with an unnamed man who wishes to join his favorite company, the Panda Rabbit Imagin obliges by dropping him through the roof before intending to travel back in time to 2006, only to be foiled by Kamen Rider Den-O Sword Form. The Panda Rabbit Imagin is voiced by Kōji Ochiai.
 * Snail Imagin (スネールイマジン): A namesake/"The Snail and the Rose Tree"-themed Imagin sub-species and Kai's servants. Kai sends a female whip-wielding Snail Imagin to form a contract with Yuto Sakurai's unnamed teacher so she can travel back in time to 1993 to eliminate Sakurai's past self. After she seemingly succeeds and is killed by Kamen Rider Den-O Liner Form, Kai sends a male, pistol-wielding Snail Imagin to abduct Kohana and force Ryotaro Nogami to join him. However, Ryotaro refuses and Sakurai resurfaces alive. In response, Kai forms a contract with the second Snail Imagin to send him back in time to 1999 and complete the female instance's mission, only for the monster to be killed by Kamen Rider Zeronos Zero Form. Additionally, a second male Snail Imagin appears in the series finale as a minor member of Kai's army. The female Snail Imagin is voiced by Nanaho Katsuragi (葛城七穂) while the male is voiced by Takashi Irie (入江 崇史).
 * Oct Imagin (オクトイマジン): An octopus/"The Octopus and the Skull"-themed Imagin sub-species that possess several tentacles capable of controlling inanimate objects and wields ink-based smoke bombs. After forming a contract with Shoko Hazuki (葉月翔子), who wants Yuto Sakurai to be brought to her alive, one instance of the Oct Imagin reluctantly obliges before traveling back in time to 2006 to kill Sakurai, only to be killed by Kamen Riders Den-O Liner Form and Zeronos Zero Form. Despite this, one of his tentacles enters the time stream, infects several time tracks, and transform them into a hydra-like monster, leading to the Station Master mobilizing an army of time trains to destroy them. Additionally, several instances of the Oct Imagin appear in the series finale as minor members of Kai's army. The Oct Imagin is voiced by Kenjiro Tsuda (津田 健次郎).
 * Armadillo]] Imagin|アルマジロイマジン|Arumajiro Imajin|undefined: A namesake/"La Cancion del Armadillo"-themed Imagin and servant of Kai who possesses the ability to roll up into a ball and burrow underground and wields a mace. After forming a contract with Shirakaku member Ōzaki (大崎), the Armadillo Imagin travels back in time to 2005. After overpowering Kamen Riders Den-O and Zeronos, he stows away on the DenLiner to destroy a time station, only to be killed by Kamen Rider Den-O Climax Form. The Armadillo Imagin is voiced by Wataru Takagi (高木 渉).
 * Albinoleo Imagin (アルビノレオイマジン): An albino "The Man Who Found a Gold Lion"-themed variant of the Leo Imagin and servant of Kai. He is sent back in time to 2007 to kill Airi Nogami, but the monster is killed by Kamen Riders Den-O Liner Form and Zeronos Zero Form as well as the latter's future self. The Albinoleo Imagin is voiced by Takaya Kuroda.
 * Snowman Imagin (スノーマンイマジン) A namesake/"Frosty the Snowman"-themed Imagin who wields a cane and possesses the ability to produce ice breath. After forming a contract with an unnamed store owner, who wishes to deplete his stock, the Snowman Imagin steals it and gives them out as Christmas presents before traveling back in time to 2007, only to be killed by Kamen Rider Den-O Liner Form. The Snowman Imagin is voiced by Tōru Ōkawa (大川 透).
 * Other Imagin:
 * Death Imagin (デスイマジン): A namesake/"Death's Messengers" (死神使い)-themed Imagin that is armed with a double-headed scythe and was created from Kai's memories, serving as an extension of his will, though his life is tied to Kai's. The Death Imagin and Kai are killed by Kamen Rider Den-O Sword Form via his allies' combined energies. The Death Imagin is voiced by Hiroshi Yanaka (家中 宏).
 * Molech Imagin (モレクイマジン): A thorny devil/"We All Came From Eggs" (ご先祖様はみんな卵)-themed Imagin sub-species. During the events of the film Kamen Rider Den-O: I'm Born!, one instance forms a contract with robber Hiroshi Katō (加藤 浩) to help Gaoh hijack the DenLiner before the Molech Imagin is killed by Kamen Rider Den-O. In the series finale, a second Molech Imagin appears as a member of Kai's army. The Molech Imagin is voiced by Hidenori Tokuyama (徳山 秀典).
 * Bloodsucker Imagin (ブラッドサッカーイマジン): A leech/"Leeches and Master Kobo" (ヒルと弘法大師)-themed Imagin who appears exclusively in the film Kamen Rider Den-O: I'm Born!. He forms a contract with Shōichi Ike (池 祥一) to help Gaoh by distracting Kamen Rider Zeronos before he is killed by Kamen Rider Den-O Climax Form.
 * Cobra Imagin (コブライマジン): A namesake/"The Bear Fighting Hero"-themed Imagin sub-species. During the events of the film Kamen Rider Den-O: I'm Born!, one instance assists Gaoh in finding the GaohLiner and attempting to kill Ryotaro Nogami until he is killed by Kamen Rider Den-O Wing Form. In the series finale, a second Cobra Imagin appears as a member of Kai's army. The Cobra Imagin is voiced by Takashi Hagino (萩野 崇).
 * Salamander Imagin (サラマンダーイマジン): A namesake/"An incarnation of the Death God Xolotl"-themed Imagin who appears exclusively in the film Kamen Rider Den-O: I'm Born!. He assists Gaoh in unearthing the GaohLiner and possesses a member of the Sanada Ten Braves until he is killed by Kamen Rider Den-O Rod Form. The Salamander Imagin is voiced by Masato Uchiyama (内山 眞人).
 * Gecko Imagin (ゲッコーイマジン): A namesake/"The Mystery of the Newt" (井守の怪)-themed Imagin sub-species. During the events of the film Kamen Rider Den-O: I'm Born!, one instance assists Gaoh before he is killed by Kamen Rider Den-O Gun Form. In the series finale and the film Saraba Kamen Rider Den-O: Final Countdown, multiple Gecko Imagin serve Kai and Shiro respectively. The Gecko Imagin is voiced by Kenichi Suzumura (鈴村 健一).
 * Newt Imagin (ゲッコーイマジン): A namesake/"The Mystery of the Newt"-themed Imagin sub-species. During the events of the film Kamen Rider Den-O: I'm Born!, one instance assists Gaoh before he is killed by Kamen Rider Den-O Axe Form. In the series finale and the film Saraba Kamen Rider Den-O: Final Countdown, multiple Newt Imagin serve Kai and Shiro respectively. The Newt Imagin is voiced by Yasuka Saitō (齋藤 ヤスカ).
 * Pink Rabbit Imagin (ピンクラビットイマジン): A rabbit/"The Tortoise and the Hare"-themed Imagin who serves Negataros until they are killed by Ryutaros.
 * Clown Imagin (クラウンイマジン): A namesake/Pulcinella-themed Imagin who serves Negataros until they are killed by Kamen Rider Zeronos Vega Form. The Clown Imagin is voiced by Chihiro Suzuki.
 * Ghost Imagin (ゴーストイマジン): A namesake-themed Imagin and one of Shiro's enforcers who possesses Ryotaro Nogami to force him to help facilitate his master's plans and appears exclusively in Saraba Kamen Rider Den-O: Final Countdown. In pursuit of this, the Ghost Imagin uses Ryotaro to transform into Kamen Rider Yuuki Skull form before he is eventually separated from him and killed by Kamen Rider Den-O Climax Form. The Ghost Imagin is voiced by Hiroshi Kamiya (神谷 浩史).
 * Phantom Imagin (ファントムイマジン): A namesake-themed Imagin and servant of Shiro who is killed by Kamen Rider New Den-O and appears exclusively in Saraba Kamen Rider Den-O: Final Countdown. The Phantom Imagin is voiced by Takuma Takewaka (竹若 拓磨).
 * Shadow Imagin (シャドウイマジン): A namesake/shadow person-themed Imagin and servant of Shiro who is killed by Kamen Rider New Den-O and appears exclusively in Saraba Kamen Rider Den-O: Final Countdown. The Shadow Imagin is voiced by Tomokazu Sugita (杉田 智和).
 * Piggies Imagin (ピギーズイマジン): A three-headed namesake/"The Three Little Pigs"-themed Imagin who appears exclusively in Episode Red of the Cho Den-O trilogy. Unlike other Imagin, the Piggies Imagin is three brothers who share one body, with the oldest brother serving as the dominant head, the middle brother as the right pauldron, and the youngest brother as the left pauldron. After forming a contract with Hiroshi Kikuchi (菊地 宏), who seeks to impress Airi Nogami by rescuing her, the Piggies Imagin orchestrates a string of near-fatal incidents and sabotages the DenLiner to stop Kamen Rider Den-O from interfering. Eventually however, the Imagin gives up on the contract before they are killed by Kamen Rider Den-O Climax Form. In order from oldest to youngest, the Piggies Imagin is voiced by Kazuya Nakai (中井 和哉), Kohsuke Toriumi and Tetsuya Kakihara (柿原 徹也).
 * Mantis Imagin (マンティスマジン): A namesake/The Mantis and the Moon-themed Imagin who appears exclusively in Episode Blue of the Cho Den-O trilogy. After forming a contract with Miku Uehara (上原 美来), who took her late grandmother for granted and wishes to spend more time with her, the Mantis Imagin steals a Rider Ticket from the Time Terminal to help her travel back in time to days before her grandmother died. Despite successfully fulfilling the contract, the Mantis Imagin is killed by Kamen Rider New Den-O. The Mantis Imagin is voiced by Michie Tomizawa (富沢 美智恵).
 * Turkey Imagin (七面鳥イマジン): A namesake/The Fighting Cocks and The Turkey-themed Imagin who appears exclusively in the non-canonical novel Kamen Rider Den-O: The Demon Dog of Tokyo World Tower. After forming a contract a pet dog named Hisui (翡翠), who wishes to protect his human owner, Kensuke Aoto, the Turkey Imagin travels back in time to September 15, 2008 to warn Kensuke to avoid losing too much money before he is defeated by Kamen Rider Den-O Sword Form, transforms into a Gigandeath Heaven, and killed by the DenLiner.
 * Cat Imagin (キャットイマジン): The Turkey Imagin's namesake/"Puss in Boots"-themed subordinate who possesses super-speed and appears exclusively in the novel Kamen Rider Den-O: The Demon Dog of Tokyo World Tower. The Turkey Imagin tasks the Cat Imagin with distracting the Kamen Riders while the former tries to fulfill his contract holder's wish. Despite his powers, the Cat Imagin accidentally kills himself with Kamen Rider Den-O Sword Form's DenGasher.

Negataros
Negataros (ネガタロス) is an Oni/"Issun-bōshi" (一寸法師)-themed Imagin, founder of the Negataros Corps, and evil counterpart of Momotaros who seeks to restore the Imagins' timeline and appears exclusively in the film Kamen Rider Den-O & Kiva: Climax Deka. Having survived Kai's death and obtained the means to become Kamen Rider Nega Den-O (仮面ライダーネガ電王), he leads other surviving Imagin in forming an alliance with a group of Fangires and mobsters, but is foiled by double agent Yuto Sakurai and killed by Kamen Riders Den-O and Kiva.

Utilizing a Den-O Belt and Rider Pass, Negataros can transform into Kamen Rider Nega Den-O Nega Form (ネガフォーム). While transformed, he wields the Nega DenGasher (ネガデンガッシャー) and commands the Nega DenLiner (ネガデンライナー).

Negataros is voiced by Hikaru Midorikawa (緑川 光).

Kotaro Nogami
Kotaro Nogami (野上 幸太郎) is Ryotaro Nogami's arrogant future grandson partnered with an Imagin named Teddy who can transform into Kamen Rider New Den-O (仮面ライダーNEW電王), utilizes the New DenLiner, and first appears in the film Saraba Kamen Rider Den-O: Final Countdown.

Utilizing the New Den-O Belt (NEWデンオウベルト) and a Rider Pass, Kotaro can transform into Kamen Rider New Den-O Strike Form (ストライクフォーム). While transformed, he possesses a DenGasher and can wield Teddy as the Macheteddy, Urataros as the Uratazao (ウラタザオ) fishing rod, Kintaros as the Kintaono (キンタオノ) battleaxe, and Momotaros as the Momotaken (モモタケン) sword. Additionally, while possessed by Deneb, Kotaro can assume his own version of Vega Form, allowing him to wield the DenGasher in its Naginata Mode (ナギナタモード).

Kotaro Nogami is portrayed by Dori Sakurada (桜田 通).

Teddy
Neotaros (ネオタロス), also known as Teddy (テディ), is an Oni/Momotaros-themed Imagin and Kotaro's partner who can transform into the Macheteddy (マチェーテディ) blade for his use in combat and is introduced in Saraba Kamen Rider Den-O: Final Countdown. Unlike other Imagin, Teddy is based on Kotaro's memories of Ryotaro and Momotaros' exploits instead of a literary folktale.

Teddy is voiced by Daisuke Ono (小野 大輔).

Shiro
Shiro (死郎) is a necromancer capable of reviving Imagin and humans who can become Kamen Rider Yuuki (仮面ライダー幽汽) and appears exclusively in the film Saraba Kamen Rider Den-O: Final Countdown. He seeks to revive his lover Sora by switching the inhabitants of the living world and the afterlife via the power of his Ghost Train (幽霊列車), which is capable of traveling to the latter world. In pursuit of his goals, he kidnaps Ryotaro Nogami to utilize his Singularity Point status to travel through time. However, he is foiled by Kamen Riders Den-O Sword and Liner Form and New Den-O.

Utilizing the Yuuki Belt (ユウキベルト) and a Rider Pass, Shiro can transform into Kamen Rider Yuuki Hijack Form (ハイジャックフォーム). While transformed, he wields the Savage Gasher (サヴェジガッシャー) sword, exploding tops, and can perform his own version of the Terminate Flash finisher.

Shiro is portrayed by Yu-ki Matsumura (松村 雄基).

Kamen Rider G Den-O
Kamen Rider G Den-O (仮面ライダーG電王) is a police officer/police car-themed moniker shared by Reiji Kurosaki and his Imagin partner, Eve, acting as antagonists of the Cho Den-O trilogy Episode Yellow. G Den-O transforms using the G Den-O Belt (Gデンオウベルト) and armed with his own DenGasher.

Reiji Kurosaki
Reiji Kurosaki (黒崎 レイジ) is an officer of the Time Police (時間警察) who has an uneasy relationship with his mother Sayuri Mizushima (水島 さゆり). After being abandoned by his mother and Kaito stealing the Kurosaki family's heirloom gun, the combination of these tragedies turned him into distrusting humans and relies solely on Eve as both his moral support and mission partner. He arrests Kaito and the DenLiner crew for disrupting the timeline in 2008, but as Kaito recovers Sayuri's letter to prove her love for her son, Reiji's hesitance led to Eve going rogue and hijacking G Den-O. Reiji then buries the hatchet by providing Diend with his K-Touch and visiting his mother's flower shop.

Reiji Kurosaku is portrayed by Yuta Furukawa (古川 雄大) and Waku Sakaguchi (坂口 湧久) as a child.

Eve
Eve (イブ) is an artificial Imagin who was created by the Time Police as Reiji's aid. Lacking a corporeal form, Eve resides in the Rider Pass and G Den-O's dobermann-like breastplate to supply Reiji with his abilities of time travel, near-future prediction and compensating his blind spots in combat. When Reiji starts to show emotions, Eve hijacks the G Den-O form for his own and contemplates to rule the timeline through an army of artificial Imagin before he is defeated by Diend Complete Form.

Eve is voiced by Hiroki Takahashi (高橋 広樹).

Kensuke Aoto
Kensuke Aoto (青舐 健介) is a wealthy gambler who appears exclusively in the non-canonical novel Kamen Rider Den-O: The Demon Dog of Tokyo World Tower. Due to his ability to "read the future" and gambling away his wealth during a financial crisis in 2008, he becomes apathetic to everyone around him. In 2013, he attempts to demolish the Milk Dipper and the surrounding area to make way for the Tokyo World Tower skyscraper to rival the Tokyo Skytree. However, the Turkey Imagin travels back in time to prevent Kensuke from losing his money.

Kajiwara Kagetoki
Kajiwara Kagetoki (梶原 景時) is a fictionalized version of the historical figure of the same name and a Time Jacker who appears exclusively in the novel Kamen Rider Den-O: Deneb Kanjinchou. He travels to the Heian period of Japan.