Caster is... a guy? I'm not sure what to put here if I'm actively avoiding spoilers for his True Identity. I eventually managed to get someone with both a beard and a face out of Nightcafe, it's pretty great.

... Uh, he is a specific person from at least one of history, myth or legend. His appearance is a compromise in my brain between history, legend and anime, and then between me and Nightcafe over implementing the thing.