|“||I'm a nice guy so I can't just leave you alone.||”|
Physically, he appears as a young twenty year-old with pale white skin and silver hair adorned with a crimson cloth on the top. He has rainbow-colored eyes with the kanji for Upper Moon (上弦) on his left eye and his rank (弐) engraved in his right.
His attire consists of a blood-red shirt with a light golden belt and baggy pants with a striped pattern. Draped over his shoulders is a cloak, black and purple in color. On occasion, Doma may be seen with a black crown-like hat with golden accents equipped with long, flowing black ribbons on either side. This, along with his twin fans made out of gold with engraved lotus designs and strands of jade-colored strings flowing from the end of the fans act as his primary weapons.
He is outwardly friendly, possessing an approachable and charismatic air, yet he undeniably deadly and calculating. Under the belief that he is saving women from their suffering, Doma happily devours his followers and other young women. And while he may appear caring toward his comrades, he doesn't feel genuine grief over their deaths.
Doma is quite nihilistic and lacks human emotion, admitting that even during his human days, the entire concept of emotion was completely foreign to him. Aware that this is abnormal, Doma compensates his empty "heart" with lies, learning to fake his emotions enough to deceive all but the most keen observers. He is shown to be a psychopath, lacking of empathy even for his dying parents, merely complaining about the smell of blood. In addition to his incapability to feel emotions, Doma has also displayed inhuman amounts of pain tolerance, if not outright congenital analgesia. He's displayed several disturbing habits such as sticking his finger into his skull, puncturing a hole straight through his temples, and then fondling and fiddling with his brain in order to stimulate his memories from his long life with a complete serene expression in his face. During his interactions with fellow Upper Moon, Akaze (UM3), he showed no negative reactions to his constant physical fatal attacks and to his head being blowing off. In fact, he considers this to be their form of personal "greeting" between two "best friends". Doma has even implied that he enjoys these physical abuses as seen when he morbidly asked Muzan with excitement on what type of extreme self harm he should inflict on himself as punishment for his failure and again after Shinobu's numerous attempts to poison him.
Despite leading a cult, Doma is an atheist who staunchly believes that gods, Buddhas, and the afterlife does not exist. He believes that after death there is nothing and that people who "could not accept something so simple" are naive and dumb. However, after his death he accepts that he was wrong and that Heaven and Hell actually do exist. He also displays what arguably is first true emotion—a crush on Shinobu Kocho, asking: "Is this what people call love? You're cute, Shinobu."  .
As a Human
Because of his beautiful rainbow-colored eyes, Doma was seen as a supernatural being since birth and was groomed into the religious leader of the Eternal Paradise cult, a position he maintains to the present day.
When he was still a child, his mother had a mental breakdown and stabbed his father to death for having affairs with other female cult disciples. Immediately afterwards, she committed suicide by poisoned herself. Despite this series of events happening in front of him, Doma only felt annoyed by the mess and disgusted by the pungent smell of blood.
When he was 20 years old he met Muzan Kibutsuji, who transformed him into a demon.
As a Demon
At some point, Doma became Upper Moon Six of the Twelve Demon Moons. During that time, he encountered the siblings Gyutaro and Daki, both at death's door—Gyutaro had been stabbed in the back, while Daki was burned to the point of being unrecognizable. Doma offered to turn the pair into demons, challenging them to join the Twelve Demon Moons and become Upper Moons themselves. At some point, Doma became Upper Moon Two, surpassing Upper Moon Three Akaza despite becoming a demon more recently than the latter.
Fifteen years prior to the present, Doma had a brief history with Inosuke Hashibira. His mother, Kotoha, escaped from her abusive household with him and found refuge in the Eternal Paradise cult. Although Doma considered her stupid, her beauty and singing talent convinced Doma not to consume her and to simply let her live her life. However, she discovered he was devouring other followers and fled from the temple with Inosuke in her arms. Before she could be killed, she dropped Inosuke off a cliff in hopes that he would survive. Doma shortly caught up with them, killing and then eating her.
A few years before the present he encountered and fought Kanae Kocho. He mortally wounded her, but was forced to retreat from the rising sun before he could devour her.
At the gathering of the Upper Moons, Doma questioned Akaza's lack of concern for him, placing a hand on his colleague's shoulder. He expressed his worry for his comrades' safety, before engaging Gyokko in small talk about his pot and the one he had been given. An irritated Akaza told Doma to move his hand, punching him when he didn't immediately comply. Regenerating the damage almost instantly, Doma complimented his fellow Upper Moon, wondering if he had gotten stronger since their last meeting. Soon after, Muzan Kibutsuji arrived, and Upper Moon Two listened as his leader reported Gyutaro's death. Doma apologized, eagerly wondering what kind of punishment Muzan would inflict on him, but was instead told that nothing was expected of him.The eccentric Demon questioned this, but Muzan pointed out the continued existence of the Ubuyashiki family and the failure to find the Blue Spider Lily caused Doma to concede that he wasn't the best at detective work. He later approached Gyokko, eager to accompany him on his new mission, but had the top half of his head destroyed by Akaza for not following their leader's orders.
Doma swiftly regenerates from this and attempts to placate Kokushibo, who had cut off Akaza's hand for disrupting the hierarchy. Hearing it hadn't been for his benefit, Doma noted that Kokushib's suggestion that Akaza should apply for a bloody battle would be a waste of time given their difference in strength and that he hadn't dodged Akaza's blow on purpose. He then cheerfully bid Kokushibo goodbye, again attempting to engage Akaza in conversation, and once more tried to join Gyokko and Hantengu on their mission. Failing on both accounts, he attempts to flirt with the Biwa Demon, only to be rejected and transported back to his home, where he was told that his followers had arrived. Putting on a ceremonial hat, he instructs the messenger to bring them in.
Abilities and Powers
Regeneration - He displayed incredibly powerful regenerative powers, as seen when Akaza punched off both his lower jaw and his upper head he managed to heal himself with little to no effort and even considered it as a friendly gesture. During his battle against Shinobu Kocho he managed to break down and render the all of the various poison mixtures Shinobu injected into him useless and recovered from with no trouble. Even when Doma himself absorbed her body and ingested over 37 kilograms worth of poison (70 times more the lethal), it still took a considerable amount of time before it began to have any adverse affect on him.
Absorption - Doma displayed the ability to completely absorb and devour an entire human body without eating them, having completely broken down and incorporated Shinobu Kocho's body into his own within only a few minutes of killing her.
Blood Demon Technique (
Doma's Blood Demon Techniques are all primarily based on creating and producing ice and frost using his own flesh and blood. His combination of battle techniques and skill is powerful enough to overwhelm and defeat Harishas without any difficulty. He usually channels these techniques via his two fans.
- Wilted Hanging Garden (
枯 園 垂り Karesono Shizuri?) - A series of 8 to 10 successive attacks generated through the movement of Doma's fans, they move rapidly to create gusts of razor-sharp attacks.
- Freezing Fog (
凍て 曇Itegumori?) - A gust of wind generated by Doma's fan that then creates a cloud of ice particles that freezes objects that it comes into contact with and spreading cold air that if inhaled can completely freeze and destroy the intended victims lungs by simply breathing it in.
- Lotus Ice (
蓮 葉 氷Hasuhagōri?) - Doma creates various ice lotuses to attack or ensnare his target.
- Scattering Lotuses (
散り 蓮 華Chiri Renge?) - Doma creates several slashes of snow fall and ice to tear through his opponents flesh.
- Arctic White Princesses (
寒 烈の 白 姫Kanretsu no Shirahime?) - The user creates two female humanoid figures with ice that is able to blow cold wind similar the that of Freezing Fog to its intended target. However, unlike the earlier mentioned technique, it has been noted by Kanao that this technique has a much larger and wider range.
- Wintry Icicles (
冬され 氷柱Fuyusare Tsurara?) - Doma creates multiple ice spears/stakes to impale his target from long range.
- Lotus Vines (
蔓 蓮 華Tsuru Renge?) - Doma creates a blizzard of ice cubes shaped like lotus petals that he then sends towards his target to tear them to shreds.
- Crystal Prince (
結 晶ノ 御 子Kesshō no Miko?) - Doma creates miniature ice replica's of himself to battle his opponents,Doma has been shown to create up to three clones of himself all possessing the same amount of combat prowess as himself and are fully capable of using his Blood Demon Techniques with the same amount of power. Doma also noted that the dolls are also capable of recording and saving whatever they see as Doma planned to record both Inosuke and Kanao techniques in order to create suitable counter measures against them.
- Hoarfrost — Waterlily Bodhisattva (
霧 氷・ 睡 蓮 菩 薩Muhyō — Suiren Bosatsu?) - This is Doma's strongest Blood Demon Technique. He creates a large Bodhisattva ice statue to attack and destroy his targets, with the statue being capable of creating powerful cold gushes of wind capable of easily freezing someone to death.
- (To Gyutaro and Daki before turning them into demons) "What we call life is precious. You gotta value it." Chapter 96, page. 19
- (To Akaza) "You're my precious buddies. I don't want aaaanyone to wane out now." Chapter 98, page. 7
- (To Gyokko) "Is that a new pot? It's pretty. The pot you gave me is in my room. I planted a girl's severed head in it for decoration." Chapter 98, page. 7
- (To Kanao) "You know... I have spoken to many girls, but... This is the first time I've talked to such an unkind girl as you. Why do you say such spiteful things?" Chapter 157, page. 14