Katherine

“Naturally, Coach Hedge went ballistic; but Percy found it hard to take the satyr seriously since he was barely five feet tall.
"Never in my life!" Coach bellowed, waving his bat and knocking over a plate of apples. "Against the rules! Irresponsible!"
"Coach," Annabeth said, "it was an accident. We were talking, and we fell asleep."
"Besides," Percy said, "you're starting to sound like Terminus."
Hedge narrowed his eyes. "Is that an insult, Jackson? 'Cause I'll—I'll terminus you, buddy!”
― Rick Riordan, The Mark of Athena

“The meeting was like a war council with donuts. Then again, back at Camp Half-Blood they used to have their most serious discussions around the Ping-Pong table in the rec room with crackers and Cheez Whiz, so Percy felt right at home.”
― Rick Riordan, The Mark of Athena

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

“Annabeth,” he said hesitantly, “in New Rome, demigods can live their whole lives in peace.”
Her expression turned guarded. “Reyna explained it to me. But, Percy, you belong at Camp Half-Blood. That other life—”
“I know,” Percy said. “But while I was there, I saw so many demigods living without fear: kids going to college, couples getting married and raising families. There’s nothing like that at Camp Half-Blood. I kept thinking about you and me…and maybe someday when this war with the giants is over…”
It was hard to tell in the golden light, but he thought Annabeth was blushing. “Oh,” she said…
“I’m sorry,” he said. “I just…I had to think of that to keep going. To give me hope. Forget I mentioned—”
“No!” she said. “Gods, Percy, that’s so sweet.”
― Rick Riordan, The Mark of Athena