Toshiro Hitsugaya doesn't exist. Sure he's real but he isn't actually. Toshiro Hitsugaya is actually a vampire called Sleepy Ash. His actual name is Toshiro but he came up with a surname, Hitsugaya for his mask. Toshiro is the Soul Prince. Yes that's right, the son of the Soul King. Toshiro used to be human (Soul) but one day, he was kidnapped and turned into a vampire. The Soul King was furious. The person who made Toshiro into a vampire was killed by Toshiro. The Servamp creator's son made a Servamp that shouldn't exist, Tsubaki. 1000 years before the first episode of Bleach, Toshiro left the Soul King realm and found himself a eve. A eve that was a Shinigami and that he fell in love with, but she was killed 500 years later. Leaving Toshiro heartbroken, so he made up his mind and choose to never have another eve again. Now it's the Winter War and everything is going down. In this I'm going to switch up the Servamps a bit, so there will be a few that won't exist but their personalities will be within the person.