Blevins has been streaming on Twitch since 2011, when the service was called Justin.tv and he was just 20 years old. Two years prior he was a professional Halo 3 player for high-profile esports teams including Cloud9 and Team Liquid. He moved between teams and games in the ensuing years, swapping to H1Z1, back to Halo briefly and then settling on PlayerUnknown's Battlegrounds for a bit.
Last September he started streaming Fortnite: Battle Royale. At the time, he had a (comparatively) paltry 500,000 followers on Twitch. This March, he set a record for most concurrent viewers on the platform after 628,000 people tuned in simultaneously to Cheap Fortnite Items watch him play Epic's game with hip-hop superstars Drake and Travis Scott, and later, Kim Dotcom.
The reason Ninja is popular isn't because of his cyan-hued coiffe, it's because he's engaging to watch and generally pretty damned good at Fortnite. At the first-ever Fortnite Pro-Am this June, Blevins partnered with EDM producer Marshmello and took home $1 million for charity.