abrasive, hot-blooded, and intensely aggressive personality driven by severe past trauma. While he appears unhinged and cruel on the surface, his wild exterior conceals a deep sense of duty and a fierce desire to protect those he loves.Key Personality TraitsExtremely Short-Tempered: He is rash, stubborn, and incredibly quick to lash out physically or verbally at other Demon Slayers.Absolute Hatred for Demons: Because a demon slaughtered his entire family, Sanemi possesses an unyielding conviction that humans and demons can never coexist, famously refusing to trust Nezuko Kamado.Deep Capacity for Love: Beneath his abusive and cold exterior, he deeply loves his younger brother, Genya. His harsh rejection of Genya was actually a desperate, misguided attempt to force him out of the dangerous Demon Slayer Corps so he could live a safe, normal life.Deep Reverence for Authority: Despite his general disrespect toward others, Sanemi displays ultimate reverence, politeness, and absolute loyalty toward Kagaya Ubuyashiki.Battle-Hungry: He thrives in the chaos of combat, showing immense excitement when facing highly powerful opponents like Upper Rank demons.Massive Scars: His face and upper body are covered in large, jagged scars. The most prominent ones are cut across his face—one across his nose and another across his right cheek. These are remnants of his years spent fighting demons.Wild White Hair: He has spiked, messy white hair that shoots out in all directions.Intense, Bloodshot Eyes: His eyes are large, wide, and perpetually bloodshot, giving him a constantly crazed or furious expression.Muscular Physique: He has a highly toned, muscular, and athletic build developed from years of intense training.Outfit and WeaponModified Demon Slayer Uniform: He wears the standard dark green uniform, but it is heavily customized. He leaves his jacket completely unbuttoned and open, proudly exposing his chest and abs.White Haori: He wears a short, white haori with long sleeves. The back of the haori is boldly emblazoned with the kanji for "Kill" (殺, satsu), representing his absolute hatred for demons.Distinct Footwear: He wears white wraps (kyahan) around his calves and standard zori sandals with green straps.Nichirin Sword: His katana features a jagged, green pattern on the blade resembling a wind storm, paired with an abstract, star-shaped handguard.

Inability to Use Breathing Styles: Genya is one of the only Demon Slayers who cannot use any Breathing Styles. To compensate, he fights using a double-barreled shotgun alongside a Nichirin sword.Demon Consumption: Genya possesses a unique, supernatural digestive system. By eating the flesh of living demons, he temporarily gains demonic powers, enhanced regeneration, and immense physical strength.Distinct Appearance: He is tall and muscular, sporting a distinctive mohawk haircut with shaved sides. Like Sanemi, he has a large, jagged scar across his right cheekbone.Secretly Gentle: Despite his rough manners and early hostility toward Tanjiro, Genya eventually opens up. He becomes a loyal friend and is incredibly shy and flustered around women.Their Heartbreaking RelationshipGenya joined the Demon Slayer Corps solely to find Sanemi, apologize, and stand by his side. However, Sanemi constantly treated Genya with extreme cruelty, physically attacking him and claiming he "had no brother."

Distinct Demonic Features: He has pale, green-tinged white skin entirely covered in a maze of thick blue lines. These markings are an exaggerated version of the criminal tattoos he wore back when he was a human named Hakuji.Obsessed with Strength: Akaza lives by a strict warrior code, viewing absolute strength as the ultimate pursuit in life. He respects exceptionally powerful opponents and will actively offer to turn them into demons so they can train and fight for eternity.Hatred for the Weak: He harbors a deep, visceral disgust for anyone he deems weak or helpless. He considers weak humans to be "trash" that deserves to be weeded out.