Doma is outwardly friendly and cheery, possessing an approachable and charismatic air. Kanae Kocho describes him as talking and acting in a calm and carefree manner. However, it is soon revealed that Doma has psychopathic tendencies. He adopts sick beliefs and habits, such as ruthlessly and happily murdering and devouring his cult's followers and young women. He believes he is saving them from their suffering by letting them live inside his body.

Under his carefree and unassuming demeanor, Doma is a cold and calculating individual with an extremely keen intellect. His high intelligence may be the reason why he looks down on humans, genuinely believing that they are pathetic and stupid. He even cried out of pity for them. His condescending attitude towards humans was also showcased when he was decapitated by the combined efforts of Shinobu Kocho, Inosuke Hashibira, and Kanao Tsuyuri. He felt insulted to be killed by individuals whom he thought lowly of.

It is later revealed that Doma is clinically apathetic, completely emotionless, and unable to experience proper emotions. Doma himself admitted that the concept of emotion was completely foreign to him, even as a human. Aware that this is abnormal, Doma compensated for his empty heart with his own charisma. He learned to express his carefree demeanor enough to deceive all but the most keen observers.

Abilities

Overall Abilities

As the holder of the second highest ranking member of the Twelve Kizuki, and the third most powerful of his kind to have ever existed, Doma is an exceptionally powerful demon. His combination of combative prowess and his potent cryokinetic Blood Demon Art in battle is powerful enough to overwhelm and defeat the Insect Hashira, Shinobu Kocho, without any difficulty, and he is also noted to have defeated Kanae Kocho, the late Flower Hashira, in the past. Afterwards, Doma could take on both Inosuke and Kanao, who were on par with the Hashira, simultaneously without much effort either.

According to Doma, Akaza, who holds the rank of Upper Three, would have no chance in defeating him in battle.[20] Moreover, Doma was able to surpass Akaza in a shorter period of time, showcasing the immense power gap between the two demons. As further credence to Doma's immense power, he rarely fights seriously and instead adopts a casual and carefree attitude even in life-and-death situations against the most powerful Demon Slayers, only ever becoming serious when his life is in serious danger, such as when the deadly effects of Shinobu's poisons became apparent

een Intellect: Doma is exceptionally intelligent, which he displayed on multiple occasions. While in a fast-paced brawl with Kanao, he was able to process and deduce her abilities, surmising that it was her superhuman eyesight that allowed her to parry and dodge his ice attacks and immediately develop a strategy to counter it. In another instance, when he left Kanao and Inosuke to fight his ice clones, he construed that Inosuke had an acute sense of touch just by observing his behavior when near his ice techniques.

It is also implied that Doma was able to trick and deceive all of his followers, allowing him to kill and eat them. He was able to keep this up for over a century with almost complete infallibility. Doma also possesses incredible memory, being able to remember even the most insignificant details from back when he was human, which was over a century ago.

Demon Abilities

Biological Absorption: Doma briefly displayed the ability to absorb human bodies through physical contact, shown when he completely broke down and assimilated Shinobu's body within only a few seconds of killing her. He mostly uses this ability as a faster alternative of consuming humans during battle.

Immense Regeneration: As an Upper Rank demon, Doma possesses one of the most advanced and powerful regenerative healing factors in existence. When Akaza punched off both his lower jaw and the upper portion of his head, he instantly healed with ease, even considering the fatal attack to be a friendly gesture. Doma also took mere seconds to recover from Shinobu's onslaught of fatal Wisteria poison attacks and from a deep slash in his abdomen which caused his guts to spill out. Even when Doma absorbed Shinobu's body and ingested over 37 kilograms worth of poison, approximately 700 times[21] more than the lethal amount needed to kill an average demon, it still took a considerable amount of time before it began to have any adverse effect on him.

Reactive Adaptation: During his battle against Shinobu, he is able to break down and render all of the various poison mixtures Shinobu injected into him useless, immediately developing antibodies to her poison without much trouble. Shinobu herself was shocked at how fast Doma built a resistance to her normally fatal poison.
Physical Abilities

Immense Durability: As an Upper Rank demon who has assimilated a huge amount of Muzan's blood, Doma has an exceptionally durable body. This is shown when Kanao had difficultly slicing Doma's neck even when his body was falling apart due to the extreme dosage of poison he received. Kanao only succeeded in decapitating the Upper Rank when Inosuke used his swords to push her blade through Doma's neck.

Doma fatally injuring Shinobu CH142
Doma effortlessly blitzes Shinobu.
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Immense Speed & Reflexes: Doma possesses inhuman movement speed and reflexes, being able to move so fast he appears to teleport. Due to their rankings, it is strongly suggested that Doma is faster than Akaza, who was able to keep up with a Marked Giyu, and Gyutaro who was able to keep up with and overpower Tengen, the fastest runner among this generation's Hashira. He first displayed his immense speed during the Upper Rank meeting, where he appeared to teleport to Gyokko, which caught him off guard. Later, when Akaza appeared behind him and destroyed his head, Doma claimed that he could've easily evaded it if he wanted to, but didn't do so on purpose as he wanted to get along with him.

His imperceptible speed was further testified when he sliced a woman to pieces after Shinobu, the fastest Hashira Doma has met, brought her away from his attack range, taking the Insect Hashira a while to register the attack. Moreover, Doma was shown to be able to keep up with Shinobu's imperceptible speed for the majority of the fight. More impressively, Doma was able to deliver a deep cut to Shinobu before she could even react, effectively blitzing her. Against Kanao, a Hashira-level Demon Slayer, Doma was able to easily dodge her Crimson Hanagoromo technique while still busy absorbing Shinobu, and later managed to move so fast he appeared to teleport behind her, nearly decapitating the Demon Slayer's head.

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