Personally, I'd just use the one you have [@pkken]. While there is a version made by the manga, it's kinda hard to objectively level one's "Intelligence" in an RP. I could make a character who's S in Intelligence but that doesn't mean squat if I myself can't solve a simple riddle. Mental stuff is best left to solo authors since he can easily feed the answers to his character because they're "Smart", but you can't really do the same for characters you don't directly control. At least physical stuff could be reasonably measured by examples i.e. strong enough to dent metal, or tough enough to take a bullet.