Born June 19, 1993, Olajide Olayinka WilliamsJJOlatunji, professionally known as KSI, is an English YouTuber and rapper. KSI is the co-founder and member of the infamous YouTuber group called the Sidemen.

KSI started his YouTube career in 2009 and built a fanbase by posting commentary gaming videos of EA’s FIFA game series. Over time, KSI has expanded his content to include comedic videos and vlogs.

Currently, KSI is one of the most well-known internet personalities, with 24 million subscribers on his main YouTube channel.

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