Occisor
A kid who thinks they're the toughest in the whole school. They hear voices in their head telling them they're right and everyone else is wrong. If something doesn’t go their way, they flip out and act like the world is ending.
My cousin got a B on his math test and threw a tantrum like he’d been rejected by the whole universe.
She yelled at the cafeteria lady for giving her the wrong sandwich and stormed out.
He cried when his video game character died and refused to play again for a week.