Arthur

“Behold!" Percy shouted. "The god's chosen beverage. Tremble before the horror of Diet Coke!”
― Rick Riordan, The Mark of Athena

“It's okay,” he said. “We're together.” He didn't say you're okay, or we're alive. After all they'd been through over the last year, he knew that the most important thing was that they were together. She loved him for saying that.”
― Rick Riordan, The Mark of Athena

“Correct." Kekrops sounded bitter, like he regretted his decision. "My people were the original Athenians--the gemini."
"Like your zodiac sign?" Percy asked. "I'm a Leo."
"No, stupid," Leo said. "I'm a Leo. You're a Percy.”
― Rick Riordan, The Blood of Olympus

“Monkey bar," Annabeth said. "I'm great at these." She leaped onto to the first rung and start swinging her way across. She was scared of tiny spiders, but not of plummeting to her death from a set of monkey bars. Go figure.”
― Rick Riordan, The Battle of the Labyrinth