Missing-one

“Hades raised an eyebrow. When he sat forward in his throne, shadowy faces appeared in the folds of his black robes, faces of torment,as if the garment was stitched of trapped souls from the Fields of Punishment, trying to get out. The ADHD part of me wondered, off-task, whether the rest of his clothes were made the same way. What horrible things would you have to do in your life to get woven into Hades' underwear?”
― Rick Riordan, The Lightning Thief

“Deadlines just aren't real to me until I'm staring one in the face.”
― Rick Riordan, The Lightning Thief

“Grover was sniffing the wind, looking nervous. He fished out his acorns and threw them into the sand, then played his pipes. They rearranged themselves in a pattern that made no sense to me, but Grover looked concerned.
"That's us," he said. "Those five nuts right there."
"Which one is me?" I asked.
"The little deformed one," Zoe suggested.
"Oh, shut up.”
― Rick Riordan, The Titan’s Curse

“You are okay?" he asked. "Not eaten by monsters?"
"Not even a little bit." I showed him that I still had both arms and both legs, and Tyson clapped happily.
"Yay!" he said. "Now we can eat peanut butter sandwiches and ride fish ponies! We can fight monsters and see Annabeth and make things go BOOM!"
I hoped he didn't mean all at the same time, but I told him absolutely, we'd have a lot of fun this summer.”
― Rick Riordan, The Battle of the Labyrinth