Skeletal Anatomy: He possesses a highly unnatural, contorted frame. His upper torso is muscular but hunched, while his waist is so severely emaciated and thin that it looks skeletal.Skin & Complexion: His skin is a deathly, pale gray-green. The dark, ink-like blotches from his human life remain, splattered across his face and body like birthmarks or severe bruising.Face & Teeth: He has a wide, thin-lipped mouth that permanently exposes sharp, jagged, uneven fangs. His eyes are deeply bloodshot with dark rings around them, featuring bright yellow sclera and orange irises.Upper Rank Engraving: His irises are permanently engraved with the kanji for Upper Rank Six (上弦 陸).Toxic Hair: His unruly, messy hair spikes upward and is dual-colored, transitioning from pitch black at the roots to a vibrant, toxic green at the tips.Attire: He goes completely shirtless, wearing only tattered, dark pants held together by a rough rope sash, with dark cloths wrapped tightly around his forearms and shins. Envy and Hatred of the FortunateSpiteful Resentment: He harbors an intense hatred for anyone born with good luck, wealth, or physical beauty.The "Debt Collector" Mindset: He views the world through the lens of a debt collector. If someone has something good, he believes it is an unfair debt that he must violently take back from them.Arrogance and Mockery: He is incredibly arrogant in battle, frequently taunting and mocking his opponents. He takes sadistic pleasure in breaking his enemies' spirits before killing them.Protective Devotion to DakiUnconditional Love: The absolute sole exception to his hatred is his younger sister, Daki. He possesses a fierce, deeply protective devotion to her.Self-Sacrificing Nature: He views Daki as his pride and joy. He gladly hides inside her body, letting her take the spotlight as Upper Rank Six and only emerging to protect or avenge her when she is in danger.Shared Trauma: His love for her is tragic; he blames himself for her suffering as a human and is willing to go to hell with her, refusing to leave her side even in the afterlife.Self-Loathing and ParanoiaInsecurity: Because he was constantly called ugly and filthy during his youth, he is deeply insecure about his own appearance.Self-Harm Habits: When he is deeply frustrated, stressed, or envious, he compulsively scratches his own skin and flesh until he bleeds, showcasing his unstable, chaotic mental state. Gyutaro’s trauma is the core driver of his identity, shaping his appearance, personality, and why he chose to become a demon. His entire existence is rooted in a childhood of extreme physical neglect, social isolation, and horrific violence in Yoshiwara's lowest class Absolute Poverty and NeglectStarvation from Birth: Gyutaro was born as an unwanted child to a poor prostitute. He was so severely malnourished that he spent his childhood eating bugs, lizards, and dirt just to survive. This profound starvation permanently stunted his body, leaving him with a skeletal, contorted frame.Extreme Isolation: From the moment he was born, he was treated as an outcast. Because he was dirty, smelled bad, and had dark birthmarks, the people of the entertainment district physically abused him and openly called him a monster, instilling a deep sense of self-loathing.The Burden of Protecting Ume (Daki)His Sole Light: Everything changed when his younger sister, Ume (later Daki), was born. Unlike him, she was remarkably beautiful. Gyutaro took immense pride in her beauty, feeling that her existence finally vindicated him against a cruel world. He took on the role of a ruthless debt collector to provide for her.The Turning Point: The trauma peaked when Ume was only 13 years old. She blinded a samurai in the eye with a hairpin to defend herself, and in retaliation, the brothel manager and the samurai bound her and burned her alive.The Ultimate Betrayal and DespairHelplessness: Gyutaro returned to find his sister’s charred, barely living body. When he tried to save her, he was ambushed and stabbed in the back by the samurai and the brothel manager.Complete Abandonment: Bleeding out and carrying his dying sister through the snow, Gyutaro begged for help from the citizens of the town, but everyone ignored them or took pleasure in their demise. This absolute abandonment broke his humanity, creating a permanent hatred for gods, buddhas, and fortunate people.