Muzan

Description: A millennium ago, during the Heian Era, Muzan was turned into a demon during an experimental treatment trying to cure his terminal illness, and his goal since then was to live without the fear of death and become truly eternal. He plans to accomplish this in two ways: finding the Blue Spider Lily or creating more demons in hopes that one day, one would be able to conquer their weakness of sunlight.

Appearance: Muzan's hair is long and white due to Shinobu’s poison. He has numerous mouths all over his limbs, each one lined with a set of incredibly sharp fangs. His skin also appears to have a dark-red mass growing from the ends of his limbs and branching onto his body. It is later revealed that Muzan has an array of scars across all his body from the wounds inflicted during his first battle against Yoriichi, which had burned down into him to a cellular level and never fully healed despite hundreds of years. His scars aren’t visible in plain sight and come to light as he weakens. He also has the ability to grow nine whips from his back and form his arms also into whips.

Personality: Muzan is normally 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. It is revealed that Muzan's true fear of dying and immense desire to live and survive was due to him being born "dead," where his heart would constantly stop in his mother's womb and was assumed stillborn until he fought to breathe before his cremation. Muzan's desire for "life" and his near constant struggles while human constructed his obsessive ambition to survive, and he truly felt vulnerable whenever he was reminded of his human frailty. However, even when on the brink of death, he is still utterly unrepentant of murdering and eating humans for a thousand years, stating that he could not remember a single person he had killed. But because of the final battle, he is now weak and vulnerable, something that he would never show to someone or anyone in general. Being dazed by the thought of coming so close to death and being burned in the sunlight.