"I don't know what grafting is, but can it attach a fully functioning tail?" He waves his tail in demonstration.

He could see someone painting their body, gluing on horns or whatever, though he's not sure how someone could get their eyes to turn silver. Illusion magic, he supposes, could handle both that and the tail. But is it truly so strange for someone to be a Tiefling? It seems stranger to him to think that someone might want to pretend to be one. Still, there's one other thing he wants to clarify.

"I'm not a villain, though."

Sure, he was just trying to seem tough and cool and like he did 'stuff', but going by the villain label just seems like it's going too far.

"Are Tieflings really that rare where you're from?"