When Doma was a boy, his mother killed his father after finding out he had been cheating on her, before she took her own life. However, Doma remained unfazed by the deaths of his own parents. When he was twenty years old, Doma met Muzan Kibutsuji, who granted him power and turned him into a demon.
When he became 20 he met Muzan Kibutsuji who transformed him into a Demon. As a Demon, Doma becomes stronger by feasting on many, many female humans who, according to Doma, better to eat because they have many nutrients inside them that are used to nurture babies.
Since Doma has indulged in nihilism, misanthropy, and committed numerous murders and atrocities, alongside being just as disgusting as Muzan, Doma has very high standards with his actions. But because of the small redeeming qualities he had, he was classified to be Near Pure Evil.
Doma was also apathetic, being entirely unable to understand and feel human emotion. When he was still a child, his mother had a mental breakdown and stabbed his father to death for having numerous affairs with many other female cult followers. She committed suicide immediately afterwards by poisoning herself to death.
Apathy: Doma is clinically apathetic, being completely incapable of feeling human emotion. Doma covers his emotionlessness with a carefree and friendly facade that was able to trick all but the most keen observers.
Because of his desire to become stronger and Doma's strength allowing him to surpass himself to become Upper Two, Akaza harboured an intense hatred of Doma. Doma, as apathetic as he is, considered him his "best friend", seemingly ignoring the contempt Akaza possessed.
History. Doma was born with beautiful and rare rainbow colored eyes. Because of this unusual trait, his parents thought that he was able to hear the voices of God and was groomed to be the religious leader of the Eternal Paradise Cult, a position that he held until his death.
And finally, let's get to the number one saddest death in the franchise, and of course, that's the death of the brightly burning Flame-Breathing user that is Kyojuro Rengoku.
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Cryokinesis: Doma's main ability is extremely powerful cryokinesis. Essentially, he can generate ice and frost from his flesh and blood and can spawn it anywhere in his vicinity, as well as manipulating it at will, allowing him to unleash incredibly potent ice techniques.
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However, Nezuko is the friendliest demon anyone will ever meet. As a human, she was just as outgoing and compassionate. But as a demon, she's proven her loyalty to not only Tanjiro, but to humanity as a whole. Unlike most demons, Nezuko managed to retain most of her human emotions.
Shinobu musters strength for one final attack, successfully stabbing Doma through his neck with a poison strike. Shinobu triumphantly relaxes as Doma seemingly begins to die from the poison. However, Doma almost instantly recovers and bear hugs the Hashira, absorbing Shinobu into himself and eventually killing her.
The only reason he did was in hopes that one demon would become powerful enough to withstand sunlight. If Muzan were to consume such a demon, he would gain the power for himself and achieve his dream of becoming the perfect being.
Apparently, he knew Inosuke's mother Kotoha as Doma's cult once took her in. It turns out that Kotoha was in an abusive relationship with Inosuke's father. However, one day she could not take it anymore and escaped with her son. The two were taken in by Doma and his Paradise Faith cult.
Tanjiro decapitates Akaza with the Hinokami Kagura: Setting Sun Transformation. Akaza was bewildered, wondering how Tanjiro did not have any fighting spirit, comparing this feeling to fighting against a plant. He acknowledges that Tanjiro surpassed his speed.
Doma met Kotoha when she was roughly 18 years old, on a cold snowy night. She came to him while carrying her baby, and pleaded for him to save them from her abusive husband and mother-in-law. As a result, Doma killed her pursuers, and accepted Kotoha and her baby into his temple.
Tengen is one of the only known Demon Slayer and Hashira to retire due to being permanently disabled instead of death or age, the other being Jigoro Kuwajima. He and Inosuke Hashibira are the only known Demon Slayers who use two Nichirin Swords instead of one.
The Wind Hashira has one of the saddest backstories in Demon Slayer. His mother had turned into a demon and had killed five of his siblings. He was forced to kill his own mother in an attempt to save his only remaining brother, Genya.
Fujikasane, Sabito, after ploughing through many demons and saving many of the other to-be slayers, encountered a powerful morphed Demon who desired to devour all of Sakonji's students. In an attempt to kill it, Sabito's blade breaks on the demon's thick neck, and he dies by the Demon's hands.
The only reason Doma couldn't regenerate his head was because he took in poison that would kill a demon 700 times over. And the fact that he got poisoned before doesn't mean he was weaker during the fight, especially since he showed no sign of it and he has regenerative abilities.
The only Demon he despises the most is the Upper Rank Two: Doma. It is quite a shocker that the second most potent Demon in the Demon Slayer is not Muzan's favorite.