Robin

“Hey, can I see that sword you were using?"
I showed him Riptide, and explained how it turned from a pen into a sword just by uncapping it.
"Cool! Does it ever run out of ink?"
"Um, well, I don't actually write with it."
"Are you really the son of Poseidon?"
"Well, yeah."
"Can you surf really well, then?"
I looked at Grover, who was trying hard not to laugh.
"Jeez, Nico," I said. "I've never really tried."
He went on asking questions. Did I fight a lot with Thalia, since she was a daughter of Zeus? (I didn't answer that one.) If Annabeth's mother was Athena, the goddess of wisdom, then why didn't Annabeth know better than to fall off a cliff? (I tried not to strangle Nico for asking that one.) Was Annabeth my girlfriend? (At this point, I was ready to stick the kid in a meat-flavored sack and throw him to the wolves.)”
― Rick Riordan, The Titan’s Curse