He is of Nigerian descent and is married to Yinka, whom he has been with since the early-90's.
Jide was born in Ibadan, Nigeria to Olatunde and Nike Olatunji. In some of Deji’s videos, Jide seems to be displeased or wince when talking about his mother. It has been confirmed that Jide's real name is Olajide Olatunji making KSI's legal name 'Olajide Olatunji, Jr.'.
Jide features heavily in many of Deji's YouTube videos, and is often used as the cameraman. Because of this, many commentators have suggested Jide create his own YouTube channel since he carries most of the weight of the ComedyShortsGamer (now Deji) channel.