Nikolai Kramer

“You are a half-blood," Zoe Nightshade said. Her accent was hard to place. It sounded old-fashioned, like she was reading from a really old book. "One of thy parents was mortal. The other was an Olympian."
"An Olympian athlete?"
"No," Zoe said. "One of the gods."
"Cool!" said Nico.”
― Rick Riordan, The Titan’s Curse

“Grover and Nico came back from their walk, and Grover helped me fix up my wounded arm.
"It's green!" Nico said with delight.”
― Rick Riordan, The Titan’s Curse

“So," I (Percy) said glumly. "We're going to get a ride from your brother, huh?"
Artemis's silver eyes gleamed. "Yes, boy. You see, Bianca di Angelo is not the only one with
an annoying brother. It's time for you to meet my irresponsible twin, Apollo.”
― Rick Riordan, The Titan’s Curse

“Bianca di Angelo shivered. "That explains Nico, you remember last summer, those guys
who tried to attack us in the alley in DC?"
"And that bus driver," Nico said. "The one with the ram's horns. I *told* you that was real.”
― Rick Riordan, The Titan’s Curse