It is possible to make a body with a little more meat on it that would carry several head-types well, which is something they're going to want to do--considering they'd want to cover everything from people who do want the classic bishounen to people who'd like something a bit more like this(me >>). They usually have three (or is it four? I haven't peeked in a bit) heads--the cute/young head, the Heroic Protagonist™ head, and the gruff head, which covers a fair amount of ground--meaning they don't all have to be serving Sesshoumaru looks. I've also seen bishounen/biseinen types on more muscular bodies and they can look fine, provided the body is well-designed to fit the proportions of it. (I bring up again the tragic comedy that is the elezen round head.)