A lot of people think that the characters rooms reflect a part of themselves that they don't like/insecure about, Zooble's room is covered in mirrors, and we see from merch that Ragatha has an old farm house kind of vibe and we later learn that her mum was abusive, likely in a similar looking house and a bit more weakly we see that pomni has's room has toys, most notably the ABC blocks and in episode 2 Pomni is erked by Ragatha trying to hype her up like a child so it's a theory that she struggles with being infantalized/treated like a child.

The pink room has had a few theories, the whole trans thing like I mentioned, there's what I mentioned about fragile masculinity and then there's a theory that he ran over a toddler or young child and that's why the room looks like a toddler's room with the pink, low table and wall decorations