Unicorn Kid's actual name is Oliver Sabin. Unicorn Kid is just the name he releases his music under.
For a while he was 'the face' of chiptune or 8-bit or whatever the fuck it was supposed to be called. It basically sounded like a Gameboy exploding and sometimes that's all it takes to make The Kids dance like mentals.
He went away for a bit but then came back having signed with Ministry Of Sound. This didn't last long, however.