He's a 2D Mario streamer lol. I'm still pretty new to following a lot of the community too tho. Thanks to Mario Maker 2 invigorating my interest in the games. I first came across Barb around the time the game released and branched off there to watch a few more folks. Also, I highly recommend checking out his Grand Poo World 2 rom hack compilation of various notable 2D Mario runners playing the game.