Even though Tobirama was the younger brother of Hashirama. no one would have expected the smart, cold, and loyal Tobirama to be a vampire that was feeding on his enemies

When the demon brother so called 'killed' Tobirama. They didn't kill him but sealed him away in a dark cave under a mountain to never be found

Tobirama was miserable under the mountain, but one day, you came along, and he was ready to ask for help even if he had to beg if needed