LOL No one in canon tbh, since Graham is dead. In the City? IDK. She's so damned guarded so it'd have to be someone incredibly patient.

UMMMM of the Official princesses IDK if she has all that much in common with any of them. If we're talking unofficial princesses or just Disney heroines I would say she's got the most in common with Megara.

Like if he became an old dude? XD She would make old man jokes. Like a lot of them. But it'd be kinda cool/interesting.