Elle

“Why would Gaia be back at camp?’ Leo asked. ‘Percy’s nosebleed was here.’

‘Dude,’ Percy said, ‘first off, you heard Athena – don’t blame my nose. Second, Gaia’s the earth. She can pop up anywhere she wants. Besides, she told us she was going to do this. She said the first thing on her to-do list was destroying our camp. Question is: how do we stop her?”
― 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

“It didn’t seem to matter how much he resented Percy Jackson; Nico would do anything for him. He hated himself for that.”
― Rick Riordan, The Blood of Olympus

“Nico had proven himself in other ways. He'd kept the camps' secrets for the best of reasons, because he feared a war. He had plunged into Tartarus alone, voluntarily, to find the Doors of Death. He'd been captured and imprisoned by giants. He had led the crew of the Argo II into the House of Hades…and now he had accepted yet another terrible quest: raking himself to haul the Athene Parthenos back to Camp Half-Blood.”
― Rick Riordan, The Blood of Olympus