Welcome to the guild! Your best bet for finding an RP that is still accepting new applicants is to look at the Interest Check section. OOCs are generally a bad place to look, but sometimes you may luck out. There's the General Interest Check section, and the Interest Check sections for each difficulty-- Free, Casual, and Advanced. 

As for finding a roleplay that will allow you to be one of the characters you mentioned-- it all depends on the GM, what their world and story is like, and how flexible they are. If none of the roleplays currently accepting seem to be what you're looking for, you could always try your hand at creating you own. Otherwise you might just have to be a little flexible yourself in the kinds of characters you play until one that WILL let you be the kind of character you want comes along.