D. Gray Man: Allen

'Another transfer student,' the Hat thought to itself as the fourth person in the group sat on the stool and pulled its brim low over his eyes. It didn't expect this boy to be much different from the other three.

Oh how wrong it was.

The hat had sorted future dark lords, victims of child abuse, and even the other three exorcists with their memories of war. After nearly a thousand years of sorting children the Hat had believed it had seen it all. The boy beneath him seemed to be trying to prove it wrong.

The first thing the Hat became aware of was that there were two minds present. They seemed to have developed a sort of coexistence that was part separation and part merged. The memories and emotions of both minds battered him, the dual nature of the mind making it harder than normal to sort out the information the poor thing was receiving.

The second thing the hat discovered was the seeping darkness that permeated their mind. Instincts based of hated and anger, a fragment of the purest evil that was interwoven into the very souls that shared the body. He had sorted human evil before, but this was something else entirely.

The third and last thing the Hat saw, the thing that finally broke the pore hat, was the memory of suffering both minds held. There were so many years of abuse and torture, physical and mental, enough for several millennia worth of lifetimes.

The pain was too much for the Hat's barriers that had already been weakened by the otherworldly darkness.

The whole hall jumped at the hat started screaming like an animal that was being flayed alive. The sound was raw agony, torn from a throat that was not designed to utter such noise. Eventually the screams formed words.

'Get away, oh mercy get me away! Please, please make it stop!' the hat yelled. A gloved hand grabbed the traumatised inanimate object, tore it from his head, and threw it to the ground.

The white haired boy with a scar on his face rubbed the back of his head self-consciously.

'Oops?' he said with an apologetic half smile. His friends just shook their heads in exasperation.

'Only you, Moyashi, only you,' Kanda muttered into the gathering silence.