We have Chiaki Nanami from Super Dangan Ronpa 2 at cosmographia who would love any cast mates! Cosmos is a game actually inspired by Steven Universe, where characters arrive in a town similar to Beach City called Waverly Bay to find they've somehow become a Gem! Each character starts with one power upon arrival and gains a new power during each monthly plot event! These can be the character's original powers or completely new abilities. I'd say we're around medium-paced right now and VERY backtag friendly!