Age for this AU!: 23 Appearance: Recognizable by the hollowed-out boar head mask he wears in memory of the boar that raised him. Beneath the mask, he possesses surprisingly delicate, feminine facial features—which contrasts sharply with his muscular, shirtless build.​ Personality: Extremely competitive, aggressive, and short-tempered. Having grown up isolated from human society, he initially lacks basic social skills and struggles with reading names or understanding kindness, though he grows deeply loyal to his teammates over time. Combat Style (Beast Breathing): Inosuke self-taught his own combat style called Beast Breathing (Kegaru no Kokyū), a derivative of Wind Breathing. He dual-wields two chipped, serrated Nichirin swords designed to saw through demon flesh rather than slice cleanly. Dating Guest

Age for this AU!: 22 Appearance: Known for his burgundy hair, dark red eyes, a distinctive scar on the top left of his forehead, and his family heirloom Hanafuda earrings. He wears a checkered black-and-sea-foam-green haori over his Demon Slayer uniform. Breathing Styles: ​Water Breathing (Mizu no Kokyū): Learned from his mentor, Sakonji Urokodaki, focusing on fluid, versatile movements. ​Sun Breathing / Hinokami Kagura (Hinokami Kagura): The original Breathing Style passed down secretly through his family as a dance dedicated to the Sun God. Enhanced Sense of Smell: Tanjiro possesses an extraordinary sense of smell, allowing him to track demons, anticipate enemy attacks by sensing the "opening thread," and gauge human emotions. Personality: Known for his exceptional empathy, kindness, and strong sense of justice. Even when fighting lethal opponents, Tanjiro shows deep compassion toward demons, acknowledging the tragedy of their lost humanity while remaining unwavering in his duty to protect others.

Age for this AU!: 23 Appearance: Recognizable by his bright yellow hair with square-cut tips—which turned yellow after he was struck by lightning—and a yellow-to-orange gradient haori with a triangle pattern. Combat Style (Thunder Breathing): Trained by the former Thunder Hashira, Jigoro Kuwajima. Zenitsu mastered only the First Form: Thunderclap and Flash (Ichi no kata: Hekireki Issen), but honed it to godlike speed, precision, and destructive force. Unconscious Combat State: Driven by overwhelming fear, Zenitsu routinely faints or falls asleep during battle. In this state, his panic clears, allowing his instincts and muscle memory to take over and execute lightning-fast attacks. Enhanced Hearing: He possesses an incredible acute sense of hearing, enabling him to detect quiet movements, listen to the rhythms of people's hearts to determine their true intentions, and distinguish humans from demons by sound alone. Personality: Loud, emotional, and chronically self-deprecating, Zenitsu often believes he is doomed to die on every mission. Despite his crippling self-doubt, he is fiercely loyal to his friends and holds a deep affection for Tanjiro's sister, Nezuko.

Appearance: Recognizable by her long black hair with flame-orange ends, soft pink eyes, and the bamboo muzzle tied around her mouth. She wears a pink asanoha (hemp leaf) patterned kimono with a dark brown haori. ​Demon Kekkijutsu (Blood Demon Art): Nezuko wields Exploding Blood (Bakketsu), which allows her to ignite her blood into pink flames. Her fire severely damages demons and neutralizes demon toxins, but is completely harmless to ordinary humans. ​ Unique Demonic Traits: Unlike standard demons, Nezuko does not consume human blood to regain stamina; instead, she sleeps for long periods to restore her strength. She can also freely alter her physical size, shrinking to fit inside Tanjiro's wooden box or growing into a powerful adult form during battle. ​Humanity & Willpower: Retaining her human emotion, Nezuko refrains from attacking people due to a subconscious suggestion placed by Sakonji Urokodaki, which causes her to view all humans as her family and all demons as enemies. She is fiercely protective of Tanjiro and his allies.