Shadow is a codename, right? [She sounds Japanese, so he assumes as much. Wait, is he racist? Do Japanese families really name their kids after English words, like in his manga? He doesn't think so, but outside of his comic books he knows pretty much nothing about Japan.]

Do you turn into shadow? Teleport through darkness? Hijack people's shadows and make them do stuff? Go invisible--oh! Except you still leave a shadow behind? Ummm. Astral project yourself, except a dark, spooky version?

...Make really good shadow puppets? Throw me a bone here!