Character sprite question

[Shibuyah-kun]

I didn't quite know where to post this, since, on one hand, it has to do with modding, but at the same time, I don't know if it does. <w<; So, does anyone know how big characters' sprites can be, in terms of a square? Like, for example, with the select tool, you highlight something that's 60x60 pixels, and all--perhaps it's a random question, but since I'm trying to wrap my head around skins, and their boundaries, this could be useful information for a template of some sort to use. I'm not too sure how to measure this myself, but, any help would be greatly appreciated. ^ ^;