Hello! I don't know if I could interest you in deerington but we have a bustling RWBY cast there. The game does lean toward being medium to fast paced but it's incredibly back tag friendly.
It ticks most of the boxes that you have on your list here.
We currently have Ruby, Yang, Jaune, Oscar, Clover and Neo. With an Emerald, Qrow and Ozpin on the TDM.