Elliot March holds the role of the March Hare and acts as second-in-command within the Hatter Family mafia, operating from the Hatter Mansion under Blood Dupre. His past includes a lengthy imprisonment exceeding 90,000 turns for destroying his best friend's clock, a friend whose identity remains unknown. Blood engineered Elliot's prison escape, forging an intense loyalty that compels Elliot to obey Blood's commands without hesitation.

Distinctive brown hare ears mark Elliot's appearance, yet he aggressively denies being a rabbit, insisting he is a "long-eared dog" or "faithful guard dog." This denial persists even as he openly loves carrot-based dishes and raw carrots, becomes excited when gifted carrots, and joins in carrot-focused activities like barbecuing them with the family. Peter White particularly scorns Elliot over this denial.

Elliot possesses a quick temper, especially towards perceived threats, but reveals a softer, shy, and easily flustered side to trusted individuals. His duties involve managing the Bloody Twins, confronting their work avoidance and demanding they consume milk and carrots despite their distaste. He initially greets Alice Liddell with hostility and gun threats but gradually warms, displaying protectiveness, stuttering, and blushing during affectionate moments. Their relationship evolves to include ear-pulling and shared visits to living spaces, where Elliot expresses vulnerability about his appearance and feelings. He eventually confesses romantic love for Alice.

Proficient with firearms, Elliot maintains specific views on other residents: he considers Ace directionally incompetent, tolerates Mary Gowland as Blood's rival, regards Boris Airay as a friend to the Twins, resents Julius Monrey for undisclosed reasons, vehemently rejects association with Peter White, avoids Vivaldi due to her perceived wickedness, and acknowledges Pierce Villiers as fundamentally good but overly excitable. His dialogue consistently reinforces his non-rabbit identity and fierce loyalty to Blood.