List of Kamen Rider Ryuki characters

Kamen Rider Ryuki (仮面ライダー龍騎) is a Japanese tokusatsu series that serves as the 12th installment in the Kamen Rider franchise and the third entry in the Heisei era. The series follows idealist journalist Shinji Kido as he attempts to stop the violent Rider War from claiming more innocent lives than it already has.

Shinji Kido
Shinji Kido (城戸 真司) is a kind-hearted, friendly, simple, and naive idealist who works at the ORE Journal as a journalist trainee until he finds one of Shiro Kanzaki's Card Decks, encounters the Chinese dragon-like Mirror Monster Dragreder (ドラグレッダー), and stumbles into the Mirror World while investigating Koichi Sakakibara's disappearance. Despite being told to stay out of the Rider War by Ren Akiyama, Shinji chooses to join anyway to stop the other Mirror Monsters from devouring people and stop the Rider War, forming a contract with Dragreder and becoming Kamen Rider Ryuki in the process. By the series finale, he dies protecting civilians from a pack of Mirror Monsters, but Shiro reverses the Rider War's events, resurrecting its participants and allowing them to resume their normal lives.

While transformed, Shinji is equipped with the Drag Visor (ドラグバイザー) gauntlet, which allows him to summon Dragreder, the Drag Saber (ドラグセイバー), the Drag Claw (ドラグクロー) gauntlet, and the twin Drag Shields (ドラグシールド) as well as perform the Dragon Rider Kick (ドラゴンライダーキック) finisher with the appropriate Advent Cards. With the Survive Rekka (サバイブ烈火) card, he can transform further into his ultimate form, Kamen Rider Ryuki Survive (仮面ライダー龍騎サバイブ), and evolve Dragreder into Dragranzer (ドラグランザー), giving it the ability to transform into a motorcycle. In this form, he wields the Drag Visor Zwei (ドラグバイザーツバイ) firearm, which can convert into the Drag Blade (ドラグブレード) sword and allow him to perform the Dragon Fire Storm (ドラゴンファイヤーストーム) finisher alongside Dragranzer.

Shinji Kido is portrayed by Takamasa Suga (須賀 貴匡).

Ren Akiyama
Ren Akiyama (秋山 蓮) is a cold loner who fights constantly and is frequently unemployed. Sometime prior to the series, he joined Shiro Kanzaki's Rider War to revive his fiancé, Eri Ogawa, who fell into a coma following an encounter with the bat-like Mirror Monster Darkwing (ダークウイング), who he formed a contract with to become Kamen Rider Knight (仮面ライダーナイト). Despite initial reluctance, he befriends Shinji Kido and fights alongside him to stop Mirror Monsters and malicious Rider War competitors until Shinji gives his life saving civilians. Ultimately, Ren faces the last participant, Kamen Rider Odin, in combat until Shiro's sister Yui dies, causing Odin to fade away. Despite becoming the winner by default, Shiro reverses the Rider War, leading to Ren becoming a full-time employee at the Atori coffee shop while Eri is revived in the new timeline.

While transformed, Ren wields the Dark Visor (ダークバイザー) rapier, which allows him to summon Darkwing, the Wing Lancer (ウイングランサー) lance, and illusionary copies of himself as well as perform the Flying Lancer (飛翔斬) finisher with the appropriate Advent Cards. On its own, Darkwing can mount itself on Knight's back to form the cape-like Wing Wall (ウイングウォール) shield and perform the Dark Tornado (ダークトーネードー) and Sonic Breaker (ソニックブレイカー) attacks. With the Survive Shippu (サバイブ疾風) card, Ren can transform into his ultimate form, Kamen Rider Knight Survive (仮面ライダーナイトサバイブ), and evolve Darkwing into Darkraider (ダークレイダー), granting it the ability to transform into a motorcycle. In this form, he possesses the left arm-mounted Dark Visor Zwei (ダークバイザーツバイ) scabbard, which can either separate into the Dark Blade (ダークブレード) sword and the Dark Shield (ダークシールド) or convert into the Dark Arrow (ダークアロー) crossbow and allow him to perform the Hurricane Edge (疾風断) finisher alongside Darkraider.

Ren Akiyama is portrayed by Satoshi Matsuda (松田 悟志).

Yui Kanzaki
Yui Kanzaki (神崎 優衣) is a young caring woman who had been aiding Ren prior to the series to locate her long-lost brother Shiro Kanzaki. While investigating Shiro's disappearance over the course of the series, she discovers the drawings they made as children served as the basis for the Mirror World's monsters and that, due to their neglectful parents, the real Yui died and allowed her Mirror World counterpart to inhabit her body. Due to being unable to survive outside of the Mirror World, the doppelganger will die on Yui's twentieth birthday, which led to Shiro developing the Rider War in the hopes of saving her. Having repressed these memories, Yui remains unaware of them until the present. Despite Shiro, Ren, and Shinji Kido's best efforts, the Mirror World Yui fades from existence short of the deadline, though her spirit appears before Shiro to tell him she did not want him to save her in the manner he wanted, inspiring him to reverse the Rider War's events.

In an alternate ending depicted in the film Kamen Rider Ryuki: Episode Final, the lonely Yui had met and befriended Shinji as children, but he seemingly abandoned her despite promising not to. Yui was invited by her Mirror World counterpart to play with her, only to learn she will immediately die if she returns to the real world. Yui's doppelganger loaned the original her lifespan, which will last until her twentieth birthday, in exchange for Yui and Shiro's drawings. After joining Ren and Shinji in their fight against the Mirror Monsters in the present, Yui eventually dies, though an angered Shiro does not end the Rider War.

Yui Kanzaki is portrayed by Ayano Sugiyama (杉山 彩乃).

Shiro Kanzaki
Shiro Kanzaki (神崎 士郎) is a mysterious scientific genius and Yui's older brother who was taken to live with relatives in America thirteen years prior to the series. He conducted research into the Mirror World (ミラーワールド), a parallel dimension opposite to the real world, before he disappeared and was presumed dead. In reality, he merged with his Mirror World counterpart to survive in the Mirror World. In the intervening years, he developed chronokinesis and created thirteen Card Decks (カードデッキ), each with their own set of Advent Cards (アドベントカード), V-Buckle (Vバックル) belts, and Visor (バイザー) card readers to establish the Rider War in the hopes of averting Yui's death, which is said to take place on her twentieth birthday, by promising to grant the winner one wish in exchange for killing their fellow competitors. By the series finale, Shiro allows Yui to die and honors her dying wish of reversing time to avert the Rider War.

Shiro developed the Card Decks and Advent Cards to allow the 13 Kamen Riders (13人の仮面ライダー) to survive in the Mirror World by forming contracts with and draw energy from their Contract Monsters (契約モンスター) in return for feeding them the life forces of the Mirror Monsters they destroy.

Shiro Kanzaki is portrayed by Kenzaburo Kikuchi (菊地 謙三郎).

Kamen Rider Zolda
Kamen Rider Zolda (仮面ライダーゾルダ) is a Rider moniker specialized in long-range combat aided by the robotic Minotaur-like Contract Monster Magnugiga (マグナギガ).

While transformed, the user wields the Magnu Visor (マグナバイザー) submachine gun, which allows them to summon Magnugiga, the back-mounted Giga Cannons (ギガキャノン), the Giga Launcher (ギガランチャー) missile launcher, and the Giga Armor (ギガアーマー) shield as well as perform the End Of World (エンドオブワールド) finisher alongside Magnugiga with the appropriate Advent Cards.

Shuichi Kitaoka
Shuichi Kitaoka (北岡 秀一) is a self-proclaimed "super-lawyer" who tends to only help someone if he has something to gain from them and was diagnosed with terminal cancer. With months left to live, he joins Shiro Kanzaki's Rider War as Kamen Rider Zolda with the hopes of achieving immortality and continuing his extravagant lifestyle. However, his condition leaves him vulnerable to fainting spells and dizziness, which eventually forces him to ask his secretary and bodyguard, Goro Yura, to take his place as Zolda during the Rider War's final stages.

In an alternate ending depicted in the film Kamen Rider Ryuki: Episode Final, Kitaoka forfeits the Rider War due to his declining health.

During the events of the crossover film Kamen Rider × Super Sentai: Ultra Super Hero Taisen, the Game World version of Kitaoka transforms into the green-colored Midorider (ミドライダー), a hybrid of Midorenger and the Double Riders. In this form, he commands the Gokaigers' Gokai Galleon.

Shuichi Kitaoka is portrayed by Ryohei (涼平).

Goro Yura
Goro Yura (由良 吾郎) is Kitaoka's loyal secretary, bodyguard, and a former client of his who is highly skilled with household work and hand-to-hand combat. Aware of Kitaoka's activities as Kamen Rider Zolda, Goro assists him as much as possible. Due to Kitaoka's cancer, Goro takes over as Zolda to face Takeshi Asakura, dying in the process before Shiro Kanzaki reverses the Rider War's events.

Goro Yura is portrayed by Tomohisa Yuge (弓削 智久).

Takeshi Asakura
Takeshi Asakura (浅倉 威) is a sadistic, cruel, bloodthirsty, arrogant, and bad-tempered criminal with a reputation for loving the act of fighting and killing during his fits of rage after he murdered his entire family as a child. After being represented by Shuichi Kitaoka, who ensured Asakura would remain in prison, the latter joined Shiro Kanzaki's Rider War to satisfy his destructive nature and formed a contract with the giant cobra-like Mirror Monster Venosnaker (ベノスネーカー), becoming Kamen Rider Ouja (仮面ライダー王蛇). With his newfound powers, Asakura breaks out of jail to seek revenge on Kitaoka upon learning of the latter's participation in the Rider War. After receiving Ren Akiyama's help in faking his death to stop the police from interfering with his activities, Asakura kills Kamen Riders Raia and Gai and takes their Contract Monsters as his own. However, the police eventually learn the truth, forcing Asakura to settle his grudge against Kitaoka in a final battle, only to learn his opponent had switched places with Goro Yura, leaving the criminal in disarray over being denied the thing he wanted most before the police kill him. After Shiro reverses the Rider War, revives the participants, and erases their memories of it, Asakura escapes from prison and goes into hiding.

Years later, during the events of the web-exclusive series Kamen Rider Outsiders, Asakura became a hired thug for a corrupt politician before he was betrayed and accepts Kamen Rider Odin's offer to participate in a new Rider Fight to evade arrest, which restores his memories in the process. Asakura subsequently kills his former employer and wins the Rider Fight before learning of Zein from Kamen Rider Diend and developing an interest in the former.

In an alternate ending depicted in the film Kamen Rider Ryuki: Episode Final, Asakura battles Kamen Rider Femme, who seeks revenge on him for her older sister's murder, before he loses Genocider to Kamen Rider Ryuga and Femme destroys his Card Deck, leaving Asakura to dissolve in the Mirror World. In the web-exclusive special ''Kamen Rider Brave: Survive! The Revived Beast Rider Squad'', Foundation X revives this version of Asakura in an artificial body.

While transformed, Asakura wields the Veno Visor (ベノバイザー) scepter, which allows him to summon Venosnaker and the Veno Saber (ベノサーベル) as well as perform the Veno Crash (ベノクラッシュ) finisher alongside Venosnaker with the appropriate Advent Cards. After killing Raia and Gai, Asakura can use their Advent Cards, fuse their respective Contract Monsters Evildiver and Metalgelas with Venosnaker to create the chimeric Contract Monster Genocider (ジェノサイダー), and perform the Doomsday (ドゥームズデイ) finisher alongside it. In Kamen Rider Outsiders, Asakura uses Kamen Rider Odin's Survive Mugen card to transform into his ultimate form, Kamen Rider Ouja Survive (仮面ライダー王蛇サバイブ), and evolve Venosnaker into a stronger form, granting it the ability to transform into a motorcycle. In this form, he wields the Veno Visor Zwei (ベノバイザーツバイ) firearm, which resembles Ryuki Survive's Drag Visor Zwei.

Takeshi Asakura is portrayed by Takashi Hagino (萩野 崇).

ORE Journal
ORE Journal (OREジャーナル) is an online journal resource where Shinji Kido worked as a journalist trainee.
 * Daisuke Okubo (大久保 大介): The editor and Shinji's senior at the ORE Journal. Daisuke Okubo is portrayed by Kanji Tsuda (津田 寛治).
 * Reiko Momoi (桃井 令子): A no-nonsense journalist whose goal is to uncover the truth behind the disappearances linked to the Rider War and the target of Shuichi's unwanted affections. Reiko Momoi is portrayed by Sayaka Kuon (久遠 さやか).
 * Nanako Shimada (島田 奈々子): A systems operator for the ORE Journal. Nanako Shimada is portrayed by Hitomi Kurihara (栗原 瞳).
 * Megumi Asano (浅野 めぐみ): Shuichi's strong yet clumsy former secretary who is later hired as a journalist for ORE Journal. Megumi Asano is portrayed by Chisato Morishita (森下 千里).

Sanako Kanzaki
Sanako Kanzaki (神崎 沙奈子) is Shiro and Yui's aunt and owner of the Atori (花鶏) coffee shop who considers herself a wise woman, claiming that her intuition is never wrong.

Sanako Kanzaki is portrayed by Kazue Tsunogae (角替 和枝).

Miyuki Tezuka
Miyuki Tezuka (手塚 海之) is a mysterious and enigmatic fortune teller who believes in predestination. While he was not originally chosen to take part in Shiro Kanzaki's Rider War, he did so after his pianist friend Yuichi Saito (斉藤 雄一) was attacked by Takeshi Asakura, declined Shiro's offer, and devoured by a Mirror Monster. Forming a contract with the stingray-like Mirror Monster Evildiver (エビルダイバー) and becoming Kamen Rider Raia (仮面ライダーライア), Tezuka seeks to avenge Yuichi by ending the Rider War, joining forces with Ren Akiyama and Shinji Kido in the process. After receiving a Survive Card from Shiro and passing it to Ren, Tezuka foresees Shinji's death at Asakura's hands. Choosing to defy fate, Tezuka sacrifices himself to save Shinji, taking the fatal blow meant for him in his place. After Shiro reverses the Rider War's events during the series finale, Tezuka is revived with no memory of his participation in it.

In an alternate timeline depicted in Kamen Rider Ryuki Special: 13 Riders, Tezuka joined the Rider War to help his former lover, Eri Ogawa, but is killed by Kamen Rider Verde.

While transformed, Tezuka is equipped with the left arm-mounted Evil Visor (エビルバイザー) shield, which allows him to summon Evildiver, the Evil Whip (エビルウィップ), and copies of other Riders' weapons as well as perform the Hide Venom (ハイドベノン) finisher alongside Evildiver with the appropriate Advent Cards.

Miyuki Tezuka is portrayed by Hassei Takano (高野 八誠).

Jun Shibaura
Jun Shibaura (芝浦 淳) is an arrogant and manipulative second-year college student at Meirin University, member of the school's Matrix gaming club, and son of a company president who is well-versed in computers and programming. Seeing everyone around him as pawns he can toy with to amuse himself, Shibaura joins the Rider War simply to win it, forming a contract with the anthropomorphic rhinoceros-like Mirror Monster Metalgelas (メタルゲラス) and becoming Kamen Rider Gai (仮面ライダーガイ) in the process. Following a failed attempt at taking over the ORE Journal and serving jail time before his father and Shuichi Kitaoka bail him out, Shibaura learns Kamen Riders Ryuki, Knight, and Raia's identities and invites them to a party in the hopes of killing them. However, they get caught in a battle between Kamen Riders Zolda and Ouja, with the latter using Shibaura as a human shield to survive Zolda's finishing attack, killing Shibaura.

In an alternate timeline depicted in Kamen Rider Ryuki Special: 13 Riders, Shibaura conspires with Kamen Rider Verde to kill Ryuki, only to be attacked by Kamen Rider Odin and devoured by a Mirror Monster.

While transformed, Shibaura is equipped with the Metal Visor (メタルバイザー) shoulder pad, which allows him to summon Metalgelas and the Metal Horn (メタルホーン) gauntlet as well as perform the Heavy Pressure (ヘビープレッシャー) finisher in conjunction with them with the appropriate Advent Cards.

Jun Shibaura is portrayed by Satoshi Ichijo (一條 俊).

Kamen Rider Odin
Kamen Rider Odin (仮面ライダーオーディン) is a mysterious golden entity and sentient Card Deck who serves as Shiro Kanzaki's representative in the Rider War and Yui's guardian via host bodies and assistance from the phoenix-like Contract Monster Goldphoenix (ゴルトフェニックス). Throughout the Rider War, Odin makes brief appearances to fight the other Kamen Riders until he and Knight are left. Following a climactic battle, Odin disappears after Shiro sees the pointlessness of the Rider War upon Yui's death.

Years later, during the events of the web series Rider Time: Kamen Rider Ryuki, Odin resurfaced in a new host to commence a new Rider War through Tatsuya Kanō and his grievously injured girlfriend Sara in an attempt to revive Yui. Once Tatsuya is defeated by Kamen Rider Zi-O, Odin makes his presence known while using the Survive cards to overpower him and Kamen Rider Geiz before they use the Ryuki and Knight Ride Watches to negate his invincibility and defeat him and Zi-O negates the events. Nonetheless, Odin returns during the events of the web series Kamen Rider Outsiders to recruit Takeshi Asakura, among others, for another Rider War, only to be defeated by Asakura while Kamen Rider Diend steals his deck.

While transformed, Odin wields the Gold Visor (ゴールドバイザー) scepter, which allows him to summon Goldphoenix, the twin Gold Sabers (ゴルトセイバー) and the Gold Shield (ゴルトシールド), reverse the flow of time, and perform the Eternal Chaos (エターナルカオス) finisher alongside Goldphoenix with the appropriate Advent Cards. Additionally, he can teleport short distances, produce golden feathery gusts, and possesses the Survive Mugen (サバイブ無限) card, which renders him invincible when used in conjunction with the Survive Shippu and Rekka cards.

Kamen Rider Odin is voiced by Tsuyoshi Koyama (小山 剛志), who also voices the 13 Riders' Visors.

Satoru Tojo
Satoru Tojo (東條 悟) is a bloodthirsty and mentally unstable social outcast who developed hero syndrome and will do whatever it takes to be accepted, going as far as to kill his loved ones under the belief that the resulting grief will make him stronger. After joining the Rider War, forming a contract with the anthropomorphic white tiger-like Mirror Monster Destwilder (デストワイルダー), and becoming Kamen Rider Tiger (仮面ライダータイガ), Tojo initially aids his teacher Hideyuki Kagawa in closing the Mirror World before killing him in a twisted attempt at vindicating Kagawa's ideals about heroism. However, Tojo fell into a downward spiral of contradictions throughout the Rider War until he witnesses a father and son, who reminded Tojo of Kagawa and his own child, and sacrifices himself to save them from a vehicular accident. The next day, the newspaper would run the story of Tojo's deed, labeling him a hero. After Shiro reverses the Rider War's events, Tojo is revived with no memory of it.

While transformed, Tojo wields the Dest Visor (デストバイザー) battle axe, which allows him to summon Destwilder and the Dest Claw (デストクロー) gauntlets as well as perform the Crystal Break (クリスタルブレイク) finisher in conjunction with them with the appropriate Advent Cards.

Satoru Tojo is portrayed by Jun Takatsuki (高槻 純).

Mitsuru Sano
Mitsuru Sano (佐野 満) is the son of a wealthy businessman, who sent him out into the world to learn about life's hardships to avoid spoiling him with an affluent upbringing. As a result, Sano became a parking garage worker who cleans cars for other wealthy individuals and developed the belief that friendship, respect, and love could be bought. As a result, he joined the Rider War, formed a contract with an anthropomorphic gazelle-like Mirror Monster subspecies called Gigazelles (ギガゼール), and became Kamen Rider Imperer (仮面ライダーインペラー) to live a rich and happy life. To achieve his goal, he becomes a mercenary, attempting to sell his strength to his fellow competitors. After attaining his father's inheritance and losing his reason to fight however, Sano discovers he cannot back out of the Rider War and attempts to buy the other Riders' services in the hopes that they will fight for him. This leads to him forming an alliance with Satoru Tojo, who eventually and literally backstabs him and leaves him for dead before Kamen Rider Ouja destroys his Card Deck, leaving Sano to dissolve in the Mirror World.

While transformed, Sano is equipped with the right knee-mounted Gazelle Visor (ガゼルバイザー), which allows him to summon Gigazelles, among other Zelle-type Mirror Monsters, and the Gazelle Stab (ガゼルスタッブ) double drill gauntlet as well as perform the Drive Divider (ドライブディバイダー) finisher alongside the Zelles with the appropriate Advent Cards. Unlike the other Riders' Contract Monsters, Gigazelles exist in herds and are often accompanied by others of a similar subspecies, such as Megazelles (メガゼール), Negazelles (ネガゼール), Omegazelles (オメガゼール), and Magazelles (マガゼール); all of which retain their feral nature despite Sano's contract with the Gigazelles and often attack him as such.

Mitsuru Sano is portrayed by Takashi Hyuga (日向 崇).

Alternatives
The Alternatives (オルタナティブ) are a pair of Pseudo-Riders (擬似ライダー) created by Hideyuki Kagawa, based on Shiro Kanzaki's blueprints for the 13 Kamen Riders, who seek to close the Mirror World with assistance from the robotic, anthropomorphic cricket-like Mirror Monster Psycorogue (サイコローグ). Following the Alternatives' deaths, Psycorogue is destroyed by Kamen Rider Knight.

Unlike the other Riders, the Alternatives utilize altered V-Buckles and Card Decks to transform. While transformed, they are equipped with the Slash Visor (スラッシュバイザー) brace, which allows them to summon Psycorogue and the Slash Dagger (スラッシュダッガー) sword, transform the former into the Psycoroader (サイコローダー) motorcycle, and perform the Dead End (デッドエンド) finisher alongside Psycorogue with the appropriate Advent Cards.


 * Hajime Nakamura (仲村 創): A graduate student at Seimeiin University who originally worked under Professor Hitoshi Ejima, though Nakamura was sick the day Ejima and Shiro Kanzaki began their Mirror World-related experiments. Upon learning of what happened, Nakamura developed a grudge against the Kanzakis, studiously evaded questions related to them and Ejima, and eventually joined Professor Hideyuki Kagawa in his effort to stop the Rider War as the primary Alternative. However, Nakamura is killed by Satoru Tojo, who discovered the former only sought to stop the Rider War for vengeful reasons.  Hajime Nakamura is portrayed by Junichi Mizuno (水野 純一).


 * Hideyuki Kagawa (香川 英行): A professor at Seimeiin University who discovered Shiro Kanzaki's notes on the latter's Mirror World experiments. Realizing how dangerous it was and despite not fully understanding it himself, the former used his photographic memory to duplicate the latter's work and develop the Alternative technology in an effort to close the Mirror World. Kagawa also recruited Satoru Tojo and Hajime Nakamura to help him further, becoming the prototypical Alternative Zero (オルタナティブ・ゼロ) along the way. However, he is killed by Tojo due to the latter's hero syndrome.  Hideyuki Kagawa is portrayed by Satoshi Jinbo (神保 悟志).

Guest characters

 * Koichi Sakakibara (榊原 耕一): A young man and intended participant of the Rider War who lived in the apartment where Shinji Kido became Kamen Rider Ryuki and was eaten by Dragreder prior to the series' beginning. In an alternate timeline depicted in Kamen Rider Ryuki Special: 13 Riders, Sakakibara was Shinji's predecessor as Ryuki before passing his Card Deck to him and dissolving in the Mirror World. Koichi Sakakibara is portrayed by Keiichi Wada (和田 圭市).
 * Eri Ogawa (小川 恵里): Ren Akiyama's fiancé who ended up hospitalized and in a coma after being attacked by Darkwing. Eri Ogawa is portrayed by Mahiru Tsubura (つぶら まひる).
 * Masashi Sudo (須藤 雅史): A corrupt police officer who uses his job to cover his illegal activities and eliminate witnesses to his crimes. After killing his partner and antique shop owner, Tomoyuki Kaga (加賀 友之), for demanding a larger cut from his profits, Sudo was approached by Shiro Kanzaki and offered to participate in the Rider War. Gladly accepting, Sudo formed a contract with the anthropomorphic crab-like Mirror Monster Volcancer (ボルキャンサー) and became Kamen Rider Scissors (仮面ライダーシザース) to better facilitate his crimes by feeding his victims to his Contract Monster. While transformed, Sudo is equipped with the left arm-mounted Scissors Visor (シザースバイザー) shears, which allows him to summon Volcancer, the Scissors Pinch (シザースピンチ) gauntlet and the Shell Defense (シェルディフェンス) shield as well as allow him to perform the Scissors Attack (シザースアタック) finisher alongside Volcancer with the appropriate Advent Cards. In the present, he hospitalizes Reiko Momoi after she starts investigating Kaga's shop. When Shinji is assigned to the case, he tries to befriend Sudo, believing he is Kaga, and inadvertently reveals personal details about himself and his allies. Using this information, Sudo attempts to kill his competitors and kidnap Yui to gain leverage over Shiro, but Ren realizes Sudo's true identity and damages his Card Deck. With the contract null and void, Volcancer turns on Sudo, devouring him like it did his victims.   In an alternate timeline depicted in Kamen Rider Ryuki Special: 13 Riders, Sudo conspires with Kamen Rider Verde to kill Shinji, only to be killed by Kamen Rider Ouja. Masashi Sudo is portrayed by Takeshi Kimura (木村 剛).
 * Hitoshi Ejima (江島 均): A former professor at Seimeiin University who helped Shiro perform the experiment that resulted in Eri Ogawa's coma. Following this, Ejima left his job and wandered the city with a Seal Card to protect himself from the Mirror Monsters. After losing the card, he returns to his lab to beg for Shiro's help, only to die of a heart attack upon seeing Yui. Hitoshi Ejima is portrayed by Senzaburo Makimura (牧村 泉三郎).

Miho Kirishima
Miho Kirishima (霧島 美穂) is a young con artist who seduces wealthy men to steal their valuables and appears exclusively in the film Kamen Rider Ryuki: Episode Final. She joins the Rider War to resurrect her sister and take revenge on her killer, Takeshi Asakura, forming a contract with the swan-like Mirror Monster Blancwing (ブランウイング) to become Kamen Rider Femme (仮面ライダーファム) and falling in love with Shinji Kido in the process. While she succeeds in defeating Asakura, she is killed by Mirror Shinji Kido.

While transformed, Kirishima wields the Blanc Visor (ブランバイザー) rapier, which allows her to summon Blancwing, the double-bladed Wing Slasher (ウイングスラッシャー) staff, the Wing Shield (ウイングシールド), which allows her to produce feathery gusts and teleport short distances, and perform the Misty Slash (ミスティースラッシュ) finisher alongside Blancwing with the appropriate Advent Cards.

Miho Kirishima is portrayed by Natsuki Katō (加藤 夏希).

Mirror Shinji
"Mirror Shinji Kido" (鏡像の城戸 真司) is Shinji Kido's Mirror World doppelganger who appears exclusively in the film Kamen Rider Ryuki: Episode Final. As a child, Yui Kanzaki met and befriended Shinji Kido, but was seemingly abandoned by him, which led to her unconsciously creating a Mirror World version of him. Similarly to humans and the Mirror World, Mirror Shinji cannot survive in the real world without disintegrating. In the present, he joins the Rider War as Kamen Rider Ryuga (仮面ライダーリュウガ), with the Asian dragon-like Dragblacker (ドラグブラッカー) as his Contract Monster, to become a real person. To achieve his goal, Mirror Shinji absorbs the original, but Shinji forces him out and fights back, eventually killing his doppelganger.

While transformed, Mirror Shinji possesses is equipped with Black Drag Visor (ブラックドラグバイザー) gauntlet, which allows him to summon Dragblacker, black versions of Ryuki's weapons, and perform his own version of the Dragon Rider Kick with the appropriate Advent Cards.

Mirror Shinji Kido is portrayed by Takamasa Suga, who also portrays the original Shinji Kido.

Itsuro Takamizawa
Itsuro Takamizawa (高見沢 逸郎) is a rich and charismatic businessman of the Takamizawa Group who appears exclusively in an alternate timeline depicted in Kamen Rider Ryuki Special: 13 Riders. Having joined the Rider War to expand his wealth further and formed a contract with the anthropomorphic chameleon-like Mirror Monster Biogreeza (バイオグリーザ) to become Kamen Rider Verde (仮面ライダーベルデ), he conspires with several of his fellow competitors to kill Shinji Kido. After killing Kamen Rider Raia, Takamizawa is killed in turn by Kamen Rider Knight.

While transformed, Takamizawa is equipped with the left thigh-mounted Bio Visor (バイオバイザー), which allows him to summon Biogreeza, the Bio Winder (バイオワインダー) yo-yo, turn invisible, assume other Riders' forms and weapons, and perform the Death Punish (デスパニッシュ) finisher alongside Biogreeza with the appropriate Advent Cards.

Itsuro Takamizawa is portrayed by Arthur Kuroda (黒田 アーサー).