TO be honest, this group's a little dead at the moment, but the premise of it was for making characters, some RPing, contests, and just whatnot. However, if you're interested, there's no problem with you making OCs for the group. With luck, things will pick up over the summer one I'm out of college.
As for abilities, I can give some examples from psyraps already in the grip; we have one with some healing powers, one that can change her skin patterns for camouflage (that's Snakehead, the leader), a couple with poison breaths, manipulating shadows, making illusions, spiky tails..really, as long as its realistic and isn't super-overpowered or magic-based, it should be fine. if in doubt, just ask and I'll approve it.