What makes a character "Feminine"

[Manly Man]

Wouldn't he just burn all of his spell slots on Disguise Self ?
He'd definitely want Extend spell as well.

Persistent Spell if at all possible.

As for the actual topic at hand, pretty much just think of aesthetics. If you want to have that paladin seem more feminine, have her armor cup her breasts, her hair long, and wear a dress or a skirt along with the armor. A sorceress could prefer certain fabrics, like velvet or silk, and enjoy putting on makeup, because it would be a terrible insult to blow up her enemies when she's badly dressed.

Really, all you need to do is think of something that would fit that character's personality, twist it to fit the class, and there you go.