You could take a look at undergrounds! We're a slow-paced AU game set in a supernatural version of modern-day London. Characters can app in as various supernatural species e.g. witches, werewolves, fae, etc. The plot is largely player-driven and focuses on supernatural politics. I'm afraid I can't offer castmates, but the game might be of interest to your superpowered characters! Here's some more info if you'd like to check it out.