Olajide Olayinka Williams "JJ" Olatunji (, oh-lah-JEE-day oh-lah-TUHN-jee; born 19 June 1993), better known as KSI, is a British YouTuber and rapper. He is best known for co-founding the British YouTube group known as the Sidemen, which has a combined 106 million subscribers. In 2019, he was ranked second by The Sunday Times in its list of the top 100 UK influencers.K

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