Well, I think that the guys that are part of the Gullwings leave something to be desired. They are not cute whatsoever, imo. I suppose out of the girls, I would say that Rikku is the hottest, only because I don't really care for Yuna that much and I'm not a fan of the look that Paine has (or her attitude). I do wonder why Rikku wears a scarf, but runs around in such a skimpy outfit...

Honestly, I think the best-looking characters in the game are Gippal and LeBlanc, but you didn't ask that.