[He looks thrown. One thing he's never done as part of the team is gone undercover for anything. Some of the others have. But his, shall we say, unique life experience means he can fit in quite as well.]

I don't-

I don't...have...one? Everyone that doesn't call me Guardian just calls me Thirteen.

[Which is really more of a code name.]

[(Very very not normal.)]

You can just...make one up for me.

[He can probably pick something that sounds very normal.]