To be honest, I'm not paticularly good at making OP's, though I can try to give you a few tips.
First of all, try not to make it all text. I like how you apart from most other people included detailed information about the character, however when it's just text, it seems to be a little "dry". Try including some pictures at places where they'd seem appropriate, and try to divide the post up in more apparent parts, by highligting the titles more. You know, rather than just bolding them, try giving them a different size or a different colour, though it isn't really necessary as it's already easy enough to find your way around the post :p
Other than that, the only thing I can really think of is CSS. It's usually something that draws members to your club, as if the CSS is decent enough, it will usually make the OP look a lot better, and the OP is like the main part of the club, at least when it concerns members. I think Ozzy linked you to his CSS guide, though just in case he didn't, --->here it is<---
If you find that you're stuck at something while making the CSS, if you choose to include it of course, there are several people on the forum that probably know how to help, whereas my first recommendation would be AlexOzzyCake. I'm not experienced in CSS myself, so I unfortunately can't help you with it.
Well, that's pretty much everything I could think of now. Hope it helps :)