Anon, this is creepy but I think I know what you're talking about. Humanoid? Green coat and green hood, right? Pale skin?

Because I ran into a guy that looked like that and when I looked at his eyes it was...strange. My thought-globe was telling me they were normal eyes but I kept seeing them as almost hollow.

Except this was in Gotham. Real shady area of town. (Not that many places in Gotham aren't shady). I thought I was just going crazy and imagining it but it put a chill down my glamprons.