"Nancy Bobofett was throwing wads of sandwich." This is character vs character because it is Percy and Grover vs Nancy.
Nancy was sitting on her butt in the fountain screaming Percy pushed me." This quote shows character vs character because Nancy claims Percy pushed her.
Percy pushed me!
Come with me Percy.
"She wasn't human. She was a shriveled hag with bat wings and a mouth full of yellow fangs about to slice me to ribbons." This quote shows character vs character because Mrs. Dodds is trying to kill Percy.
"He flailed, clawing at his chest, then began to disintegrate-not like my mother, in a flash of golden light, but like crumbling sand" This quote shows character vs supernatural because the Minotaur kills Percy's mom.
"I heard the plumbing rumble, the pipes shudder. Clarisse's grip on my hair loosened. Water shot out of the toilet, making an arc straight over my head, and the next thing I knew, I was sprawled on the bathroom tiles with Clarisse screaming behind me." This is character vs supernatural forces because Posideon made the toilets squirt Clarisse.
"Clarisse kept coming, the point of her spear crackling with energy. As soon as she thrust, I caught the shaft between the edge of my shield and my sword, and I snapped it like a twig. "Ah!" she screamed. "You idiot! You corpse-breath worm!" This is character vs character because Percy broke Clarisse's spear.