Olajide "JJ" Olatunji, better known as KSIOlajideBT, is an English YouTube personality, rapper, comedian, boxer, actor, author and co-founding member of the entertainment collective known as the Sidemen. He made his name from posting gaming–commentary videos of the FIFA video game series, although as his audience grew, his content diversified into more comedy style videos, with him later branching out into other avenues such as music, acting and boxing.