I know very little about Aster, but what I do know is that he has to be one of the most isolated members of the branch in the sense that I can't remember when was the last time he did a non Iluna collab with any of the other members of the branch. All I know is that he plays a lot of League of Legends, Valorant and some Elden Ring.
Super Rrat time, but thinking about it his self isolation from the rest of the branch might not be voluntary but rather that the rest of his branchmates isolated him because of his harrasment and forced him to look outside the company for collabs. What I'm about to say should be taken with a grain of salt cause I never watched him, but I do remember reading old posts about him getting very heated and competitive in multiplayer collabs with his branchmates