oh, ok
well homestuck is a webcomic that basically follows the story of four kids who play a game together but it takes a strange turn, i'll say
basically the game turns out to like. destroy the universe lmao
anyway theres also trolls, which is what that guy is, they are also playing their own version of the game
there's a lot of lore and it takes forever to explain but yeah I'd love to yap about it
to answer the original question, I don't remember exactly what happened but that's karkat, I kin him and yeah