Nico

“Reyna marvelled at how peaceful he looked. The worry lines vanished. His face became strangely angelic…like his surname, di Angelo. She could almost believe he was a regular fourteen-year-old boy, not a son of Hades who had been pulled out of time from the 1940s and forced to endure more tragedy and danger than most demigods would in a lifetime.”
― Rick Riordan, The Blood of Olympus

“He carried so much sadness and loneliness, so much heartache. Yet he put his mission first. He persevered. Reyna respected that. She understood that. She'd never been a touchy-feely person, but she had the strangest desire to drape her cloak over Nico's shoulders and tuck him in. She mentally chided herself. He was a comrade, not her little brother. He wouldn't appreciate the gesture.”
― Rick Riordan, The Blood of Olympus

“No,’ Nico said. ‘Getting a second life is one thing. Making it a better life, that’s the trick.’ As soon as he said it, Nico realized he could’ve been talking about himself. He decided not to bring that up.”
― Rick Riordan, The Blood of Olympus

“Nico, I've seen a lot of brave things. But what you just did? That was maybe the bravest.”
― Rick Riordan, The House of Hades