Douma

Douma's special demon ability is cryokinesis, which allows him to create ice from his flesh and blood. He can then use these ice constructs to weaponize, such as spikes or stalagmites. He can also freeze the surrounding air to hobble movement and stiffen it.
Douma is considered one of the most imposing villains in Demon Slayer. He was eventually killed by Inosuke and Kanao after Shinobu absorbed him and poisoned him.
Douma has a backstory that involves his birth into a royal family, and his father being the head of Eternal Paradise. His father thought he was a supernatural being because of his rainbow colored eyes and white hair, and made him the boss of his cult instead of him. His parents also groomed him to be the religious leader of the Eternal Paradise Cult, and didn't show him love or real emotions.

wears a red turtleneck with black ink markings that look like blood dripping down his chest and shoulders. The same pattern is repeated on his wrists, hands, and a small, circular "blood stain" on his head. He also wears tan hakama pants with a pinstriped design, a pale green-tinged golden belt, and black tabi socks. Doma sometimes wears a black coat, a black and gold crown-like hat, and two pieces of black and purple cloth tied around his neck.

has a friendly and unassuming demeanor, but is actually cold, calculating, and has a keen intellect. He is a psychopathic, deranged, ruthless, misanthropic, and manipulative nihilist who is unable to understand basic human emotions. He has a cynical view of the world and his own grotesque ideal reality.

appears to care about his fellow Upper Moons, and even cries when he learns that Akaza died. However, Doma doesn't actually feel anything for them, and he doesn't feel any type of human emotion, even when he was human. He compensates for this by lying and learning to fake his emotions, making him able to trick many people.
Doma has many relationships, including:
Akaza
Doma considers Akaza his "best friend", but Akaza hates Doma because Doma's strength allows him to surpass himself and become Upper Two.
Daki & Gyutaro
Doma found Gyutaro and Ume on the brink of death and initiated their transformations into demons.
Kanae Kocho
Doma fought Kanae until dawn, forcing him to escape before the sun rose. Kanae was left with major injuries and died soon after their battle.
Doma also has a cult called the Eternal Paradise Faith, whose followers worship him as a god and he sometimes gives them advice. Doma prefers to eat young women because he believes their meat is superior. He also has a steady supply of human meat from his followers who willingly seek him out.

has a deep hatred of humanity and makes enemies wherever he goes. He is also depicted as having a cynical view of the world and his own grotesque ideal reality.Douma is the only demon who continues to serve the emotional needs of humans after becoming a demon. He is friendly and polite to everyone, even hugging and complimenting Shinobu as he ate her. However, he has a lack of fear and inability to show true emotion, which infuriates Muzan, who desires to be feared and respected. Muzan never liked Doma as a result.
Douma also has a deep-seated animosity with Akaza, another Upper Rank demon. Although Doma joined the Kizuki much later than Akaza, he quickly surpassed him in both power and ranking.

Doma's Blood Demon Art is cryokinesis, which allows him to manipulate ice and create powerful attacks with it. His ice is lethal to inhale, and his attacks are enhanced by his Japanese war fans. Doma's strongest Blood Demon Art is Hoarfrost・Waterlily Bodhisattva, which involves creating a large ice statue of a Bodhisattva to attack and destroy his targets. The statue can create cold gushes of wind that can freeze someone to death.

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