My only real requirement for a rp is that it's strictly on the high end of semi-literate or literate. I can't stand when people don't post with 3 or more sentences because I tend to go off with longer posts and get left in the dust when they all race ahead and post 5 single sentence posts >.< So yeah... Literate rp's for me.
Other than that, species and mapped/mapless doesn't matter. I tend to avoid Lion rp's as a general rule, but I've played other big cats, wolves, warrior cats, elementals, dragons, etc... I don't get very picky as you can see. My last dragon rp has just recently died because the members stopped coming after stuff happened irl so I'm looking for a new one of those. My other two rp's right now are an elemental wolf one and a maples pack in South Pole.