Inner Morgan: "Tall. Long legs. You?"

Physically--yeah, tall girls are good. He doesn't really have a particular type physically beyond long-legged and somewhat athletic.

Mentally--Sharp. Smart. Kind and compassionate are high on his list, as well as tough--the life of a Mage ain't easy, and if they're going to be in on the secret, they probably need to be all of the above, and more so if not. He doesn't seem to mind hyper girls, or snarky girls either.