For Thusia? I'm considering a fourth because I keep making activity*. I tried out Hanani from the Dreamblood duology mostly because I wanted to play with her magic (she's a combination healer/dreamwalker), but got no hits in the test-drive thread. (Speaking of, I need to hit up some of the new accounts in that, lest people think we're cliquish.) Other than that, I don't know: there's always a few of my OCs.

(I'm also considering hiatusing Toph so I can canon-update her, since I have some of the Avatar comics. She gets a mini-arc in the first post-series comic story about opening her school and learning a thing about teaching, while Zuko and the Earth King work out their daddy issues by nearly restarting the war they ended.)

What about you?

* That's my guideline for games: if I can easily make activity for the characters I have, then I can consider a new one.