Mahiru Hīragi

Mahiru was from the prestigious Hīiragi Clan, and next in line to become head of the family; however, as a namanari, she eventually turned into a demon, and ended up being sealed within Guren's sword, becoming a cursed gear called Mahiru-no-yo. In the light novels, Mahiru is described as a beautiful young girl with long ashen hair with short sidelocks, and amber eyes. Shinoa Hīragi has commented that her half-sister was taller and way more voluptuous than herself. When she was a namanari, Mahiru displayed no distinct physical features that showed the demon was in control except for a red glint in her pupils that rarely showed. After becoming a vampire, her eyes became red and grew fangs. She is usually seen with the First Shibuya High School uniform, a sailor fuku, which consists of a blouse with red trim around the collar with a grayish blue sailor-style collar which also has red trim and a similarly colored skirt with a belt. The red uniform ribbon which is thinner than normal sailor fuku is attached to the bottom right end of the collar. The school's emblem is located on the right breast. She wears thigh length grayish blue stockings and dark blue dress shoes along with it. Mahiru was a very popular member of the prestigious Hīragi Family and was famous for treating the other clans with kindness and equality. She is shown to be gentle, sweet, and charming in Guren's flashbacks, such as sharing a cake with the latter, and showing concern over the bruises he received from his brutal training; however, Mahiru is also shown to bow down to the pressure of her family, such as hiding and refusing to meet Guren when her family sent two people to interrogate him. Her great intelligence and skill made her father favor her, but she hated the Hīragi Family. Mahiru appeared to be less cold-blooded and ruthless than her half-brothers, saving Sayuri when Seishirō beats her and attempted to strip her as she did not like picking on others. She was noted as a perfectionist, more likely stemming from having many expectations on her while doing battle with the demon born inside her. Mahiru appears to value human life more than her family, shown in her desperation to save Shinoa, who also had a demon inside her, and Mahiru ultimately took Shinoa's demon and sacrificed the rest of her humanity for her half-sister. What's left of Mahiru's human side is often seen wrestling for control with her demonic side in the light novels. Whenever Guren is injured, such as when he sliced off his own arm to stop the spread of the demon's curse, Mahiru's human side is able to resurface briefly, crying as she desperately tries to reattach Guren's arm. She also at times desperately warns Guren not to be fooled by what her demon side says and expresses deep remorse and guilt over what she put Guren through along and also hated herself for doing it. She even went as far as to request to be killed by Guren. Mahiru is in this state for most of the Catastrophe light novels. The demonic side of her gradually takes more and more time in control of her body and twists her love for Guren by starting his transgression into demon hood as well. Her need for power to protect and be with Guren warps into a desire to either rule or destroy the world. Mahiru-no-Yo laughs often and loves to mock Kureto and the other characters. She has no sympathy or compassion for anyone and is willing to ruthlessly kill anyone who stands in her path and is even cruel to them. Among the very few things that remained of her previous self was her love for Guren but even then, she is not above being cruel and be willing to harm him. Her love is also twisted so that while she will not kill Guren, she is absolutely delighted when Guren shows his strength or touches her and wants him to give in to his demon and join her. She is, however, not above showing other dark emotions whenever Guren is involved, showing cold rage when Guren coldly said he didn't gain power just to be with her and a strong sense of jealousy towards the girls who love Guren despite knowing how Guren would never fall for them as he only loves her and acts particularly cruelly due to this, along with also showing resentment at even Guren's other friends, noting that she wants him to kill all of them and actually being bitter when referring to how Guren wanted to protect both her and them. Along with that, she maintains contact with Shinoa, seeming to indicate she retains her care for her. Since the human and demonic personalities are in flux, they can be seen arguing and fighting for control when the demon puts Guren in danger. Mahiru's personalities no longer fluctuate, and she expresses both the haughty playfulness of her demon side and the hopeless love of her human one. She is now consumed by lust for blood, especially Guren's, and she enjoys feasting on people's blood and drinking them dry. She also enjoys battles and manipulating others to do her will. Her human personality seems to be about as strong as her demon one, however, which manifested in her showing love for Guren and care for Shinoa as well as being much more easily angered and jealous. She gave her sister Shikama Dōji to make sure she can survive the end of the world and spared Guren despite having him at her mercy along with actually trying to protect him from her malicious experiments. While Mahiru's love for Guren made her not kill him while she killed all of his friends, this was not granted to his female friends, who was cared for Guren in front of her, much to her cold rage, and her fiancé, who made the mistake of mocking her love for Guren, earning him a particularly painful death, as she slaughtered all of them ruthlessly but at the same time she willingly told him how to resurrect them as she died. She was also genuinely touched to the point of tears as Guren proclaimed his undying desire to save her and as she died, revealed all she wanted was to have a normal life with him.