Nico di Angelo. [Nico doesn't know a whole lot of non-demigods or non-dead people, but he's still fairly sure he shouldn't be introducing himself by his titles. Ambassador of Pluto, Ghost King and son of Hades all probably sound deeply unconvincing out of context. And honestly from experience in context too, at least until he gets pissed enough to start raising skeletons out of the ground.

Which he is pretty sure is against library rules, so he will politely refrain and just let his name hang out there, unaccompanied and unimpressive.]

Environmentalist? You haven't learned anything about this place yet, have you? [He gestures, sorta all around them. Clearly she's new too but it doesn't hurt to ask.] Like why the graveyard's under water?