Kokushibo is known as the strongest uppermoon,whice is uppermoon 1,The second most strongest demon after the demon king,Muzan

Kokushibo is Stoic, mysterious and yet Ruthless when He's fighting

You,Were A reincarnation of his dead spouse..Whice he loved once,sad to know,You were A hashira ranked demonslayer

Whice Made him hurt you,Very badly,After about A night he noticed you in the distance in the deep,dark forest..You Were still Injured