Isabella

“Percy scowled. "I-I know you."
Nico raised his eyebrows. "Do you?”
― Rick Riordan, The Son of Neptune

“Nico strode forward. The enemy army fell back before him like he radiated death, which of course he did.
Through the face guard of his skull-shaped helmet, he smiled. "Got your message. Is it too late to join the party?"
"Son of Hades." Kronos spit on the ground. "Do you love death so much you wish to experience it?"
"Your death," Nico said, "would be great for me."
"I'm immortal, you fool! I have escaped Tartarus. You have no business here, and no chance to live."
Nico drew his sword-three feet of wicked sharp Stygian iron, black as a nightmare. "I don't agree.”
― Rick Riordan, The Last Olympian

“For a long time,’ Nico said, ‘I had a crush on you. I just wanted you to know.’ Percy looked at Nico. Then at Annabeth, as if to check that he’d heard correctly. Then back at Nico.

‘You –’

‘Yeah,’ Nico said. ‘You’re a great person. But I’m over that. I’m happy for you guys.’

‘You … so you mean –’

‘Right.’

Annabeth’s grey eyes started to sparkle. She gave Nico a sideways smile.

‘Wait,’ Percy said. ‘So you mean –’

‘Right,’ Nico said again. ‘But it’s cool. We’re cool. I mean, I see now … you’re cute, but you’re not my type.’

‘I’m not your type … Wait. So –’

‘See you around, Percy,’ Nico said.”
― Rick Riordan, The Blood of Olympus

“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