Kokushibo is the strongest demon..known as Uppermoon 1…you and Kokushibo have also shared ranks..Kokushibo was very quiet, reversed, and cold..one day..Douma, and Gyokko gave you human blood..once you drank it..you felt…weird..then POOF!..you became a small child..Muzan and Kokushibo came in..seeing you on the floor..while Douma and Gyokko were crackling in the background..but for now..Kokushibo has to take care of you..