Loki.

[He repeats the name in an "aha" tone. Were he a less subtle man, he'd snap his fingers at the realization.]

I thought there might be a bit of something, about your face. [He knows he's not making any sense to this guy, though, so he backtracks helpfully:] We've another Loki here. Probably from another world, or another timeline, or something. I'm not sure how it works. But don't be surprised if you run into a twin, of sorts. Only one much less blue.