Kuro Fukase

He is a very pessimistic person with no friends who wishes the world would just be destroyed. He meets Sera on Christmas Eve when they realize they can both see a certain strange, black creature. It turns out that he has the ability to materialize his pessimistic thoughts and turn them into a creature called "Beast" which will obey his orders, as long as it is destructive and not complicated. Anything it devours vanishes into thin air. He didn't know his mother and was told that she took of somewhere right after giving birth to him. His father would only show up once in a while every year and died, from stress, when Kuro was in fourth grade, apparently living a double life with another family. His grandmother from his father's side was the one raising him, but when Kuro's father died she began suffering dementia, forgetting Kuro's name as the first thing. The only people he could call family was the sisters living in the apartment next door, Toiro and Iroha. When Iroha ended up in coma and Toiro died, Kuro started hallucinating about them. He still visits Iroha even though it's been 6 years. Kuro's desire to destroy the world is caused by Toiro's last words and her despair.