Some of your ideas are interesting, though some O/Os (I couldn't find any, so I assume you're still working on them?) would also be nice to get a better idea of your specific preferences in regards to a roleplay.
However, my lack of experience in Kingdom Hearts or Harry Potter (or actually the first half of your list, heh) put aside, I would be interested in setting something up if you like. Feel free to clicky the linky in my siggy to glance at my O/Os and send me a message if you like. We can talk some things over :)