Ali-A is one of the biggest YouTubers on the planet, and chances are you've watched one of his videos online, or have had one of your mates tell you to watch them! But he's done loads more than just play CoD and Fortnite online - find out everything you ever wanted to know about him here!
All the best heroes have names that alliterate - where the first and last names start with the same letter. Just think about Clark Kent, Peter Parker, and Sue Storm. Ali-A is the same! His real name is Alastair Aiken.
And have you ever seen him and a superhero in the same room...?
10 MILLION people subscribe to Ali's main YouTube channel. That's hard to get your head around! It looks like 10,000,000 when it's written as a number. That makes it the most popular Call of Duty channel in the world! His other channel - More Ali-A - has almost 5 million subscribers too!
For comparison, KSI and DanTDM both have 17 and a half million subscribers, so Ali has some way to go to be the biggest YouTuber in Britain!
Ali's girlfriend is called Clare Siobhán, and she's a YouTuber too! She mainly plays The Sims 4 and Pokémon. Before she was YouTuber, she used to work at Xbox! According to a recent video, the two of them are thinking of setting up a joint channel together.
They met at a gaming event called Gamescom, where they met each other at the airport flying out to the event!
They live together and in a video describing their day-to-day life, Ali says that he doesn't know how she gets all her work done in her tiny office!
Ali has a brother named Simon, who he has had on the channel to play a game they used to play when they were kids - Mario Kart! Simon is 18 months younger than Ali, and occasionally appears on the channel to play other games and answer questions from fans.
Ali and Clare have 3 pets that live with them. The most famous is probably their king charles cavalier spaniel, named Eevee, who they got as a puppy in 2016. She likes to sit on the chair behind Clare while she plays The Sims!
They also have a cat named Darcie, who sprawls out in front of Ali's keyboard while he plays games.
It's cool to have a YouTube channel with 10 million subscribers, but it's just as cool to have your own TV show! Ali-A's Superchargers, which gets shown on CBBC, is a show about kids fixing up their parents' rubbish old cars!
On his More Ali-A channel, Ali apologised to his fans for not doing more Call of Duty and Pokémon GO videos. He said the reason why was that he'd been having TOO MUCH FUN with Fortnite lately!
Ali-A doesn't just play games - he wins games. He set up a tournament for other YouTubers gamers like DanTDM, LD Shadow Lady and Syndicate and walked away with some big, big wins.
(Also, you only have to watch some of his videos of him playing Fortnite or CoD to realise that he's really, really good at those games!)
Because of his success on YouTube, Ali's got quite some fame outside of gaming too! He's hung out with celebrities like Louis Hamilton - though he says his favourite people to meet are other YouTubers because "it's great to meet other content creators". What a nice guy!
Even though it might look like Ali has THE BEST LIFE, not everything always goes his way. Last year he crashed his car - a black Audi R8 that he loved - into a hedge by accident. He was OK and he's since got another R8, but it was a bad time for Ali.
Ali is well-known for owning every current console! He has a PS4, Xbox One and a Nintendo Switch as well as a high-end gaming PC.
In fact, he's so well known in the gaming world that Nintendo gave him his Switch early, ahead of the wide release!
As revealed in a Q&A he did with Clare, when he was growing up he thought he was going to be a banker! He says "it's boring and not like a dream amazing job, but it was the direction I was heading in before YouTube happened".
(Clare was going to be a vet!)
So which of these was your favourite Ali A fact?