Luna

“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

“Really? That would be a first. I'm the son of Hades, Jason. I might as well be covered in blood or sewage, the way people treat me. I don't belong anywhere. I'm not even from this century. But that's not enough to set me apart.”
― Rick Riordan, The House of Hades

“Jason always tried to build a good relationship with his team. He'd learned the hard way that if somebody was going to have your back in a fight, it was better if you found some common ground and trusted each other. But Nico wasn't easy to figure out.”
― Rick Riordan, The House of Hades

“About five meters ahead, Nico was swinging his black sword with one hand, holding the scepter of Diocletian aloft with the other. He kept shouting orders at the legionnaires, but they paid him no attention.

Of course not, Frank thought. He's Greek.

[...]

Jason's face was already beaded with sweat. He kept shouting in Latin: "Form ranks!" But the dead legionnaires wouldn't listen to him, either.

[...]

"Make way!" Frank shouted. To his surprise, the dead legionnaires parted for him. The closest ones turned and stared at him with blank eyes, as if waiting for further orders.

"Oh, great..." Frank mumbled.”
― Rick Riordan, The House of Hades