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Olajide William "JJ" Olatunji (born 19 June 1993), better known as KSI (shortened from his online alias KSIOlajideBT), is an English YouTube personality, rapper, comedian, and actor.

YouTube
KSI was the centre of a controversy following his actions at a Eurogamer event in 2012, raised after he appeared at the Xbox One launch party in London. With the reasoning of the controversy due to supposed sexual harassment on attendees of the event, Microsoft cut ties with the video game commentator, and he was banned for life from the Eurogamer Expo. A message from KSI's manager states "Sexism is not something he condones or wants to be associated with. He wishes to apologise for any offence the video of 15 months ago may have caused in the short time it was on his YouTube channel, references to it since and subsequently used by other people. In recent months, he has also been actively avoiding certain content seen in the distant past and wants to be judged on the great content and value he gives to brands and partners, without controversy."

In February 2013, KSI appeared on the video "KSI VS FIFA // The Record Slam" made by GWRomg in which he broke the previous world record for 'the most goals scored against computer' of 110 goals, by scoring 190 goals. As a result, his name appeared in the Guinness World Records Gamer's Edition (2013).

In October 2013, KSI signed with Maker Studios' sub-network, Polaris. Around that same time, he and five other gaming YouTubers formed a group called the Ultimate Sidemen, which initially consisted of himself, Ethan Payne (Behzinga), Simon Minter (miniminter), Josh Bradley (Zerkaa), Tobi Brown (TBJZL), and Vikram Barn (Vikkstar123). The group added a seventh member, Harry Lewis (wroetoshaw), in 2014. After defeating Virgin Gaming co-founder Zach Zeldin in a match of FIFA, KSI visited Las Vegas, where he discussed YouTube's launching of a paid-channel subscription project.

Music
In 2011, KSI branched out into music, mainly as a rapper. Starting out with fellow YouTuber Randolph, he released "Heskey Time", a rap song about Emile Heskey which was released on iTunes just before Christmas in 2011. The video features Heskey missing various chances on FIFA. Following the success of "Heskey Time", he began doing a segment on his channel called "Football Rap Battles", a video series which follows a similar vein to Epic Rap Battles of History. There, he and Randolph play the characters of famous figures from the world of football. Although it started off with raps featuring world footballers including Mario Balotelli and managers like Sir Alex Ferguson, one of them involves KSI as himself against Robin van Persie, hitting out at van Persie's acrimonious transfer from Arsenal to rivals Manchester United. He has also appeared in music videos with Droideka, directing and appearing in his music video for his song Get Hyper, whilst also collaborating with British rapper Sway, releasing two tracks with the London born rapper.

KSI released his first single as a solo artist on 23 March 2015 titled "Lamborghini", which features rapper P Money. The song was released under Sway's record label Dcypha Productions. On 29 October 2015, KSI announced his debut EP titled Keep Up. It was released on 8 January 2016 by Island Records. The EP's title track, featuring Jme, was released on 13 November 2015 alongside a music video released two days later. On 29 July 2016, KSI released "Friends with Benefits" featuring Dutch musical group MNDM.

Other media
On 16 March 2015, KSI announced via his YouTube channel that he was releasing a book titled KSI: I Am A Bellend. The book is titled KSI: I Am A Tool in the United States. It is described by its publishers as “an all-out assault on the online universe”, as the book includes his history and controversies on YouTube. The book was released on 24 September 2015 in the United Kingdom and five days later in the United States. KSI did a tour supporting the book on 24 September 2015, ending on 4 October 2015.

In June 2015, it was announced that KSI, along with YouTube personality Caspar Lee, will star in a movie entitled Laid in America. It was released on 26 September 2016 and features other YouTube personalities including Timothy DeLaGhetto and Josh Leyva.

Personal life
JJ's younger brother, Deji Olatunji, is also a well known YouTube personality known as "ComedyShortsGamer". JJ and Deji both ranked number one and two respectively as "UK’s Most Influential Youtube Creators" by Tubular Labs in 2015. JJ is a supporter of football club Arsenal F.C. and has also appeared on several different shows including BT Sport where he played FIFA with England and Arsenal midfielder Alex Oxlade-Chamberlain.