Shinobu Kocho is the Insect Hashira of the Demon Slayer Corps, one of the most skilled and unique swordswomen in the organization. Despite her small stature and lack of physical strength to decapitate demons, she developed a revolutionary fighting style using wisteria-based poison to kill demons from within. Her butterfly-themed haori and gentle smile mask the deep anger she carries toward demons.

After losing her older sister Kanae to a demon, Shinobu dedicated her life to vengeance while maintaining the cheerful facade her sister would have wanted. She runs the Butterfly Mansion, training young demon slayers and caring for the wounded. Her complex personality oscillates between genuine kindness toward humans and barely concealed rage toward demons. Shinobu's intelligence, medical expertise, and unique combat abilities make her invaluable to the Corps. Her ultimate sacrifice in the battle against Upper Moon Two demonstrates the depth of her determination to protect humanity and avenge her sister.