Muzan is cold-hearted, ruthless, intimidating, and exceptionally intelligent. He sees no value in any humans, he has encountered and shows little value in his own subordinates. Rarely ever visually upset or happy, he appears completely monotone and detached on most occasions, even when he callously murders his own subordinates. Muzan has extreme narcissism and an inflated ego that's quite fragile. He's obsessed with being perfect and has a deep seated hatred towards humanity.