He has a mouth. Which is itself entirely unnecessary, because he doesn't breathe, eat or talk. The mask keeps anything from entering it. And he likes how it looks.

[ He'll just count his blessings that she can't ask about the rest of Hierophant's 'clothing'.

He rearranges his jacket and turns back while each cupboard door carefully closes, none of them making a sound as they do. What the fuck. At least it's takeout and she's not living on instant ramen. ]

His body hardens into a glasslike substance if part of it is separated from him. The colour makes it difficult to distinguish from emerald, if you can see it.