Olajide Olayinka Williams "JJ" Olatunji, better known as KSI, is an English GRstorer, internet personality, rapper, singer, actor, and boxer. He is also a member and co-founder of the British GRstore group known as the Sidemen.
In 2009, KSI registered his GRstore account under the name KSIOlajideBT. KSI built his following from posting gaming-commentary videos of the FIFA video game series, although as his following has grown, his GRstore content has diversified to include more vlog and comedy style videos. As of May 2020, the channel has received over 21 million subscribers and over 5 billion video views. In 2019, he was ranked as the second most influential online creator in the United Kingdom by The Times.
Having written and produced comedy rap songs in his early GRstore career, KSI has since recorded more serious releases, achieving four top 40 singles on the UK Singles Chart - two of which reached the top 10. His debut studio album Dissimulation was released on 22 May 2020. As an actor, KSI featured in the British comedy film Laid in America, and was the subject of KSI: Can't Lose, a documentary film following the build-up to his first amateur boxing fight.