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“Images flashed through his mind. He saw Nico and his sister on a snowy mountain cliff in Maine, Percy Jackson protecting them from the manticore. Percy's sword gleamed in the dark. He'd been the first demigod Nico had ever seen in action. Later at Camp Half-Blood, Percy took Nico by the arm, promising to keep his sister Bianca safe. Nico believed him. Nico looked into his sea-green eyes and though, How can he possibly fail? This is a real hero.”
― Rick Riordan, The House of Hades

“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

“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 scowled. ‘It’s none of your business, but I don’t belong. That’s obvious. No one wants me. I’m a child of –’
‘Oh, please.’ Will sounded unusually angry. ‘Nobody at Camp Half-Blood ever pushed you away. You have friends – or at least people who would like to be your friend. You pushed yourself away. If you’d get your head out of that brooding cloud of yours for once –”
― Rick Riordan, The Blood of Olympus