The closest anime version of Spencer Chamberlain and Aaron Gillespie (Underoath) I could come up with so far

DALL-E (Open AI) knows the two a bit better than the other models lol, though it's not yet perfect at this stage. (I'll try evolving it.) Anyway, Underoath is an American rock band (and my long-time fave); Spencer does the "unclean" vocals (singing and screaming; Aaron plays the drums and does the "clean" singing. To tell them apart, IRL Spencer currently has bleached blond hair with black/dark brown(?) roots while Aaron's hair is red.