We've all heard about the hottest, now.......

[Captain Maxx Power]

i don't think any of them are ugly. but my pick is Quistis. at least Queen Brahne possibly remains undisputed...

Pirate Red Mages have been dispatched to your current location. Your death shall be slow and hopefully painful.

Anyways, in terms of looks I'd say Paine, simply because she reminds me way too much of my gran of all people, and looks a lot like a young boy at certain angles.