[he definitely looks way more the part of a pirate than a doctor, even if both are true.

He swirls his coffee around in the cup a little]

I don't want to bore you with scientific talk. I enjoy comparative physiology, I've had my hands on wraeththu and elves here. Differences are subtle, appearances aside. Eyes and ears are boring, it's all in the way organs work and flesh and bones are nourished and animated.