Gyutaro

Gyutaro was a member of the Twelve Demon Moons, holding the position of Upper Moon Six, which he shared with his younger sister Daki.

Appearance
Gyutaro has black spot birthmarks tracing over his face and body. He has black hair with bangs and a mop hairstyle. He viewed himself as ugly when he was a human and even as a demon. He has muscular arms and legs, but the area from his chest to waist is bony and very skinny.

Personality
Gyutaro due to the hard and difficult life he lived in near constant poverty and the harsh tragedies he experienced as a human, He portrayed himself to be cruel,petty and envious of anyone blessed with a better life than him,with him developing a habit of sarcastically complementing a persons best traits and then trying to vindictively kill them afterwards, as he did with Tengen. Also as a Habit he seems to have the penchant to inflict self harm to himself when he is angry,frustrated or jealous as seen when he he scratched himself hard enough to tear deep wounds into his own flesh when he was sarcastically complementing Tengen. Due to having lived over a hundred years and battled many Demon Slayers and Pillars, Gyutaro has become somewhat arrogant and prideful in combat having developed the habit of underestimating his opponents and looking down on them as beneath him,as he did with the Team of Demon Slayers dispatch to kill him and sister having not initially attempted to fight them himself but instead allow his sister to deal with it first.Despite these negative traits however he does possess a genuine and strong love for his Younger Sister,Having raised her himself due to his mother mental instability,this familial love was so strong that despite becoming a demon and nearly forgetting his life as a human ,he still retains a strong love and attachment to her,due to this he had develop a tendency to spoil her and usually allows her to do whatever she pleases despite this going against his own best interest,However his love for her wont stop him from screaming and insulting her out of frustration.Due to the hardships he faced as a human Gyutaro eventually developed a personal belief and philosophy to take from those who have a better life then the one he had as a human,because in his belief if he does not do this it does no break even with all the misfortune he and his sister went through.

Past
As a human, Gyutaro was born into poverty within the lowest class of the Red Light District. His mother would often beat and try to kill him since she could not afford to feed him and eventually died of syphilis.

Throughout his childhood, he was berated for his appearance, voice, and poor hygiene from the other residents of the district. When his sister, Ume, was born he gained a sense of pride and acted as her "collector" within the district.

When his sister turned 13 and she began to officialy work for a brothel House,  he returned home from work to discover her tied up and burned to near death and left to die in a ditch,Due to having poked a samurai's eye out with a hairpin. He jumped into the ditch and began to hystericaly panic and tearily demanded that his sister be turned back to normal while cradling her body. As he embraces his dying sister, the same samurai whose eye was poked out, sneaks up behind Gyutaro and slashes his back in an attempt to kill him.He then overheard the samurau speaking to brothel manager who is revealed to be the one who asked to have Gyutaro killed, however before the samurai is able to finish off Gyutaro, he manages to jump out of the ditch and kill both the manager and the Samurai with his sickle.

Despite being injured, Gyutaro carried his Sister Ume's dying body throughout the district in search of help, but was ultimately denied aid no matter where he went. As he collapsed on the snow due exhaustion with his sister in his arms and both of the sibling near death, they were then happened upon the then Upper Moon Six Doma,Who then offered to "help" them by turning them into demons and challenged them to be chosen by that "Man" and join the Twelve Demon Moons themselves.

As a demon he and his Sister now known as "Daki" continued to reside in the Red Light District and continued to terrorize and feast on its inhabitants, with the siblings seemingly developing a taste of only eating from the district's finest and most beautiful Geisha's and Oirans of the district, eventually after a few unknown number of years the siblings were eventually noticed and acknowledged by that "Man" and Given the rank of Upper Moon Six of the Twelve Demon Moons that he they then shared between themselves. Somewhere along his long life as a demon Gyutaro successfully killed and ate at least thirteen Pillars of the Demon Slayer Corps while his Sister killed and ate seven.

Red Light District Arc
After a tantrum-throwing Daki called out for him, Gyutaro emerged from her body, quickly taking her to another part of the room. He reattached her severed head, comforting her while doing so. Uzui Tengen attacked the pair, but Gyutaro quickly countered it, injuring the Pillar. He then complimented the Demon Hunter on stopping his attack.

The mysterious Demon further complimented Tengen's face, skin, flesh, and height, as well as his presumed popularity with women. Feeling envious of the Pillar, Gyutaro threatened him with a painful death. Hearing Daki's complaints about Kamado Nezuko's involvement, he promised to exact vengeance upon all those who had hurt her. Throwing his sickle-like weapons with great force, which returned to him shortly afterwards, Gyutaro was unable to injure Tengen or the bystanders he was protecting. He restated his envy of the Pillar, which only increased when the Demon Hunter revealed he had three wives. The mysterious Demon unleashed his Blood Demon technique, Splatter Sickle, a barrage of blood blades. His attack accomplished nothing, as Tengen escaped through a hole he made in the floor, which surprised the emaciated Demon. Gyutaro commanded his attack to turn, revealing its auto-tracking nature. Tengen deflected the attack again, throwing and then detonating several small bombs in Gyutaro's vicinity. Wrapped in his sister's sash, Gyutaro withstood the blast, smugly stating they are one.

The emaciated Demon informed his opponent he was different from the previous Pillars he had fought, once again expressing his envy at Tengen's talents. He remained silent as the Sound Pillar rejected his claims, who cited Himejima Gyoumei and Muichirou Tokitou as examples of amazing talent, but countered by demanding to know how his Blood Sickle's poison hadn't killed the Demon Hunter yet. Moments later, Gyutaro grinned, declaring Tengen's statement of poison resistance to be a bluff, and blocked the Pillar's twins blades with his dual sickles. Clashing briefly with his opponent, Gyutaro was furious at Tengen kicking his sister. He was then surprised as Tengen threw more bombs at him and his sister, which he managed to escape unscathed. He quickly deduced the true nature of the bombs, special gunpowder capable of hurting Demons, leaving him confident in their eventual victory, but was surprised as Tengen's subsequent sword strike extended. Marveling at the Pillar's grip strength, Gyutaro deflected the attack, but was left with a slight wound to his neck. He warned Tengen of his impending death, only to be surprised by the arrival of Hashibira Inosuke and Agatsuma Zenitsu.

The mysterious Demon reiterated his death threat, believing the arrival of the Pillar's subordinates to be insufficient. Tengen remained confident in their victory, having deduced that cutting off both of the siblings' heads off at the same time was the key to success, but Gyutaro assured him it wouldn't be easy to accomplish. He also mentioned how he and his sister had eaten numerous Pillars, fifteen and seven, respectively. He then watched silently as Daki was taken onto the roof by Zenitsu, with Inosuke going to assist the towheaded youth in his fight, but remained confident that she would prevail. Utilizing his connection with his sibling, Gyutaro closed one of his eyes, and quickly attacked Kamado Tanjiro. He nearly struck a blow to the youth's neck, but was thwarted by Tengen at the last second causing him to only stab him in the chin mere inches away from the fatal strike, and proceeded to exchange a flurry of blows with his opponent. In the middle of this clash, sashes from his sister's conflict above them descended, prompting Gyutaro to call Tengen's claim of success to be a lie, as well as labeling his adversaries as incompetent for lack of movement control.

Human
As a Human, he learned how to use a hand scythe by playing with one as a child growing up in the lower caste of the Red Light District and his skills greatly improved when he began to use this skill as a Debt Collector. Being already full capably of moving his body incredibly fast to catch a trained Samurai by surprise and killing him.

Demon
As a Demon, he has incorporated his scythe skills with his Demon Powers, by creating a pair of Hand Scythes using his flesh and blood and coating them with a incredibly fatal poison to further its effectiveness in battle, being fully capable of engaging a Pillar and at least four other Demon Hunters and hold the advantage over them for the majority of the battle. However the most dangerous ability he displayed by far was his ability to subconsciously process and analyze the information that he receives when connected to his sister in a heartbeat,This is accomplished when he implants one of his own eye's into her forehead,allowing him to perfectly coordinate and accurately make coordinated attacks and strategies by directly controlling her body to match the pace of his own attacks and provide her with logistical support making them a deadly tag team,and upon being given one of his eye's his sister kinetic vision and reaction speed are further increased and at the same time giving him the added advantage of keeping his "Core" safe thus saving him from being killed via decapitation.

Blood Demon Arts:Techniques
Splatter Sickle - Gyuutarou releases multiple blades of blood from his sickles. These blades can be manipulated freely by Gyuutarou.

Rampant Arches of Evil - Gyuutarou slashes downwards rapidly in all directions, creating a dome of blood blades around him that defend from incoming attacks.

Round Slashes of Death - Gyuutarou releases blood blades all over his body simultaneously. This technique has massive range and Gyuutarou is even able to activate it as his head is being cut off.

Trivia

 * Muzan has stated in Chapter 98 that he was the True Holder of the Position of Upper Moon Six, not his sister.

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