He shrugs. "You are a shadow?" It's a wild guess, considering most true shadows are mindless and can't tolerate light in any form, whereas this one clearly is not and can.

He's not Sheikah, that much is for certain - he feels just a little too different, and he lacks the red eyes that all Sheikah possess, and the minor fact that other than himself and Impa ([No, not Impa any more.] [...Force of habit]), there are none left. At least, none he knows of.