I completely understand where you're coming from -- I've made it a few posts into an RP before, only to dip out when I realised it didn't quite suit the character I had in mind at all. Even with this one my initial idea for the character was not half so absurdly powerful as he ended up being... but it's the fun of the action here in Pieces of Eight, as I see it -- ridiculously powerful characters fighting against supernatural odds so massive that the balance between the two manages to even out.

If that doesn't work for you, then best of luck! (Though I don't see any reason you or the character wouldn't work -- of course, that's all for you to decide)