KSI first found fame as a YouTuber but has now branched out to being a professional boxer.
He has millions of followers across his social media channels, but what is his net worth?
KSI VS ISHOWSPEED LIVE
Who is KSI?
KSI was born June 19, 1993 and is an English YouTube personality, boxer, rapper, comedian and actor.
The star's real name is Olajide William "JJ" Olatunji.
Robbie Williams poised to launch his own brand of energy drinks to rival Prime
He went to the independent Berkhamsted School alongside future Sideman member and YouTube collaborator Simon Minter, better known as Miniminter.
KSI — which stands for knowledge, strength, integrity — first arrived on the YouTube scene back in 2009, originally posting content about video games.
Since then he has broadened his horizons and become the CEO of Misfits Boxing, the co-owner of Prime Hydration, XIX Vodka and restaurant chain Sides.
When competing as a professional boxer, KSI goes by the different moniker 'The Nightmare'.
What is KSI's net worth?
KSI is estimated to have a net worth of around £20m.
In an interview, he claimed that he owns 10 properties in the UK worth around £10m.
He has amassed nearly 11billion views from his combined channels on YouTube as well as millions of followers across his social media pages.
How does KSI make his money?
Since 2009, KSI's channel has reached nearly six billion video views on his personal YouTube channel, with 24million subscribers.
When his combined channels are included, he has more than 41.5million subscribers and 10.55billion views.
He managed to earn an NME Award for Vlogger of the Year back in 2016.
Ten YouTube boxing fights we must see in 2023 including KSI vs Jake Paul
As well as his YouTube career, KSI has released four EPs as a rapper, two of which have topped the UK R&B Albums Chart.
In 2015, he was ranked as the UK's most influential YouTube creator, with his brother Deji, otherwise known by his handle Comedy Shorts Gamer, ranking second.
In 2016, he made his feature film debut in the comedy Laid in America alongside fellow YouTube star Casper Lee.
KSI was a founding member of the online group The Sidemen, which is the product of seven British YouTubers, launching their own premium web TV series in 2018.
However, he was the centre of controversy in 2012 after a Eurogamer event due to supposed sexual harassment of attendees.
Microsoft cut ties with him and he was banned for life from the expo.
He addressed the controversy in his 2015 autobiography, entitled KSI: I Am A B*****d.
following his boxing fights against Logan Paul, KSI spent a couple of years focussing on his musical career, including releasing Really Love with Craig David and Digital Farm Animals in October 2020.
But since 2022 he has been more active in the fight game, fighting four times before his dust-up with Tommy Fury on October 14.
As well as all of this, KSI is a successful businessman — he's the the CEO of Misfits Boxing, and co-owner of Prime Hydration, XIX Vodka and restaurant chain Sides.
What cars does KSI own?
KSI splashed out some of his riches on a specialised £280k Lamborghini Aventador in 2014, that's been dubbed his "pride and joy."
The stunning Italian sports car was wrapped by celebrity customiser Yiannimize in an eye-catching purple hue.
He even released a track titled Lamborghini in March 2015, paying tribute to his beloved motor and making it the star of the video shoot.
But reports suggest he flogged the incredible vehicle at a loss two years after its music vid debut.
KSI didn't lose any sleep over it though — he still has his Porsche 718 Boxster to whizz around in, which he bought in April 2019.
The fancy motor, which carries a price tag starting at around £65k, boasts a drop-top roof and a top speed of 171mph.
And just to make sure everyone knows who is behind-the-wheel, KSI added a personalised licence plate which reads "K51 FLY".
He also impressed his army of fans with his next swanky addition to his garage — a £60,000 Porsche Cayenne.
The YouTuber flaunted the bespoke car in a series of Snapchat stories, but hasn't shared any snaps showing off the exterior.
The Cayenne is the more luxurious of Porsche's SUVs and boasts a 3.0L Turbo V6 engine.
KSI has also hinted that he has an even more exclusive motor stashed away — the luxurious Rolls-Royce Wraith.
The £250,000 car oozes opulence, as it should when it will set you back a whopping £250,000.
Although he hasn't specifically announced that he purchased one, he's been seen in LA countless times driving the Wraith.
What is KSI's fighting record?
Including his amateur fights, KSI's boxing record stands at 5 wins, 0 losses, 1 draw and 1 no contest.
From his six fights which led to a result, he won four by knockout, giving him a knockout ratio of 66.7%.
He's putting his unbeaten record on the line against Tommy Fury on October 14, which many see him as an underdog for.