Born Olajide Olatunji and commonly known as KSI, he is a YouTube and social media phenomenon, particularly in the UK, who has amassed more than 21 million YouTube subscribers. He is known for his FIFA, soccer, music, and comedy content.
He started uploading Goal of the Week videos to YouTube on May 16, 2011.
He became the face of Sport Relief online in 2014 and was active in Save the Children and prostate cancer charity promotions. At the age of 21 he was driving an orange Lamborghini.
He has a brother named Deji, commonly known as Comedy Shorts Gamer, who also became a YouTube personality.
He became a member of the Ultimate Sidemen alongside Wroetoshaw, Ethan Payne, Miniminter, Vikram Barn, and others. On August 25, 2018, he faced Logan Paul in an amateur boxing match that was declared a draw.