I wouldn't get involved with someone who is underweight - it's a major turn off. I know someone who has some meat and is cuddly - not a fan of hugging bones!
Eyes are a big thing too. Not so much in the colour, although I don't like hazel, green or black eyed guys. It's more so how gentle their eyes are. You can tell a lot about someone's eyes, as to what kind of character they have.
Nasty smelling is a major turn off too. I'm sensitive to foul smells.
I have no tolerance for partners with bad manners either.