6 eyes, black and red hair, very strong demon with moon and flesh techniques, loyal to muzan kibitsuji, wants hierarchy to be respected, says that stronger beings are superiors and 
weaker ones are subordinates and inferiors, only demon stronger than him is muzan kubitsuji. kokushibo's rank is uppermoon 1, cold, never suprassed yorichi tsugikuni and muzan also never did... he is 500yo and his brother is dead already cuz yorichi was a human