Reff Luna

“Images flashed through his mind. He saw Nico and his sister on a snowy cliff in Maine, Percy Jackson protecting them from a 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 thought, How can he possibly fail? This is a real hero. He was Nico's favorite game, Mythomagic, brought to life.

Jason saw the moment when Percy returned and told Nico that Bianca was dead. Nico had screamed and called him a liar. He'd felt betrayed, but still... when the skeleton warriors attacked, he couldn't let them harm Percy. Nico had called on the earth to swallow them up, and then he'd run away- terrified of his own powers, and his own emotions.”
― Rick Riordan, The House of Hades

“I am Persephone" she said, her voice thin and papery. "Welcome, demigods.
Nico squashed a pomegranate under his boot. "Welcome? After last time, you've got the nerve to welcome me?"
I shifted uneasily, because talking that way to a god can get you blasted into dust bunnies. "Um, Nico-"
"It's all right," Persephone said coldly. "We had a little family spat."
"Family spat?" Nico cried. "You turned me into a dandelion!”
― Rick Riordan, The Demigod Files

“I don't feel that way anymore," Nico muttered. "I mean... I gave up on Percy. I was young and impressionable, and I- I don't..."

His voice cracked, and Jason could tell the guy was about to get teary-eyed. Whether Nico had really given up on Percy or not, Jason couldn't imagine what it had been like for Nico all those years, keeping a secret that would've been unthinkable to share in the 1940s, denying who he was, feeling completely alone- even more isolated than other demigods.

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