[@Prints Avoid]
I tend to imagine Pokemon battles of characters I've created (currently the main one I've been developing for this RP). I imagine how he interacts with his family and some of the trials I'd like him to go through throughout the RP.

But, something I've PM'd [@Cynder] already, it might also help to think of developing something I haven't created or merely touched on. I've created a PM with Loony and Aphe about Rangers so that that might be further developed (since they're both planning or have interest in having characters be Rangers). 
Also, discussing possibilities between other players or the GM usually helps. But you've gotta have a character, first. And that's what Cynder's working on, now.