I think his name is Lirik, and he's one of the bigger streamers. CohhCarnage is another big one, and he may be the biggest. Both of those guys jump from game to game though, mastering each (Lirik mostly only plays shooters, but rarely sticks with one for an extended amount of time). Goth and Broman play one specific type of game exclusively with an occasional break to play something different like Dark Souls or Pokemon lol.