He started off his career as a successful YouTuber, filming videos of him playing video games like Fifa '07. Now, after more than a decade, KSI - whose real name is Olajide Olayinka Williams "JJ" Olatunji - has become a media mogul, growing his YouTube business, becoming a co-founder of YouTube group Sidemen, a CEO of Misfits Boxing, is a rapper and is the co-owner of the viral energy drink that sold out in shops in rapid timing causing punters to turn to online shops for the stuff - Prime.
Yet appearing on ITV's award-wining daytime television show This Morning, the 29-year-old rapper says it's popularity is "crazy" as he recalls seeing those who have bought the drink reselling it for over 10 times it's recommended retail price of £2.
The star was on the show to speak about his new documentary, KSI: In Real Life, which dropped on Amazon Prime on Thursday, January 26, which follows his life and explores his journey up until this point.