Erimi Mushibami represents the Mushibami family, a branch of the Hundred Devouring Families within the Momobami clan specializing in torture. This background shapes her gambling tactics and interactions. Her youthful appearance—marked by bi-colored eyes (dark pink right, blue or purple left), long pink pigtails, and Gothic Lolita style—often prompts underestimation and mockery, like Midari Ikishima calling her a "grade-schooler." She constantly carries a stuffed caterpillar plush, "Imomusshy-kun," a gift from Sumika Warakubami. Outwardly childish yet inwardly sadistic and cunning, Erimi deeply resents being dismissed by the clan. She initiates high-stakes gambles to demand respect. However, this confidence is fragile; genuine personal risk shatters her composure, exposing a fearful, tearful crybaby beneath her manipulative exterior. This duality defines her methods: she wields torture-inspired devices like the "Finger-Cutting Guillotine" to inflict psychological terror but panics when threats turn real. During the student council presidential election, Erimi challenged Yumeko Jabami and Midari Ikishima with a guillotine gamble, aiming to unseat Kirari Momobami. She rigged the device with a hidden metal plate to protect herself, relying on psychological pressure to force forfeits. Yumeko's unpredictable actions and a hint about possible tampering sowed doubt in Erimi. Consumed by paranoia and terror, she frantically cut threads while crying, ultimately withdrawing her finger prematurely and losing. Though defeated, Yumeko acknowledged her resolve, leaving Erimi remorseful yet respectful of Yumeko's fearlessness. Seeking redemption against Yumeko, Erimi later entered the clan's Rock Paper Scissors Poker tournament. After losing again and accusing Yumeko of cheating, she collaborated with Miyo Inbami to prearrange cards during Ibara Obami's game—a scheme Ibara discovered but left unpunished. Sumika Warakubami also gave Erimi election votes, transferring them for personal amusement rather than trust. Erimi avoids unnecessary violence, refusing Midari's demands for torture or physically harmful gambles. Her clan relationships remain complex: Sumika shows occasional kindness (gifting her dress and plush), while others like Miyo exploit her collusion. Despite repeated losses, she persists in major clan events, including the 100-vote auction, demonstrating ongoing tactical involvement.