Luna

“Nico drank from the chalice, then offered it to Jason. "You asked me about trust, and taking a risk? Well, here you go, son of Jupiter. How much do you trust me?"

Frank wasn't sure what Nico was talking about, but Jason didn't hesitate. He took the cup and drank.”
― Rick Riordan, The House of Hades

“But in his heart, he wanted to be at Camp Half-Blood. The months he'd spent there with Piper and Leo had felt more satisfying, more right than all his years at Camp Jupiter. Besides, at Camp Half-Blood, there was at least a chance he might meet his father someday. The gods hardly ever stopped by Camp Jupiter to say hello.”
― Rick Riordan, The House of Hades

“Is this guy Love or Death?" Jason growled.

Ask your friends, Cupid said. Frank, Hazel, and Percy met my counterpart, Thanatos. We are not so different. Except Death is sometimes kinder.”
― Rick Riordan, The House of Hades

“The truth hit him. Jason wasn't quite Roman anymore. His time at Camp Half-Blood had changed him. Reyna had recognized that. Apparently, so did the undead legionnaires. If Jason no longer gave off the right sort of vibe, or aura of a Roman leader...”
― Rick Riordan, The House of Hades