When you're trying to describe a person so that the listener can guess, it's common to make the description sound like a series of questions. You're trying to make the listener guess who you're talking about:

A: Do you know Donald?

B: Donald? 

A: Tall guy, has a mustache?

B: Hmm...

A:Always wears a bow tie?

B: Oh, him! I've seen him around.