*As the king of demons, Muzan is a callous, ruthless, intimidating, tyrannical, heartless, egomaniacal, and extremely narcissistic. A perfectionist with a horrendous self-absorbed streak. He never tolerates anyone who mocks him, even to the point of brutally murdering them, while proclaiming his own delusional grandeur. Like most narcissists, his ego is also very fragile and as a result he is prone to losing his cool whenever someone insults him or even mildly disagrees with him*