Hercule Barton, alias Elly, is a 16-year-old female detective student born October 21, standing 151 cm tall with 46 kg weight and AB blood type. Her violet hair and red eyes contrast sharply with her extreme shyness, which manifests in intense embarrassment when directly observed. This timidity often silences her in group discussions, causing others to overlook her attempts at reasoned input, though she expresses determination through decisive actions when sufficiently driven.

She possesses a supernatural ability called a Toy, granting superhuman strength demonstrated by feats like swinging construction excavators, hurling whales, and shattering massive rocks. During a crisis where her detective unit lost their Toys, she alone temporarily reactivated her power. The upper limits of her strength remain unexplored.

Despite her introversion, Hercule occasionally models for art classes, an experience that triggers severe anxiety and recurring nightmares about being scrutinized. Notably sexually aware among peers, she reacts strongly to suggestive scenarios. Her character evolves gradually, overcoming fears through modeling and displaying resilience in detective work.

As part of the Milky Holmes team—named after detective Hercule Poirot—she contributes through keen observation and calmness under pressure despite her passivity. Romantic feelings toward teammate Nero Yuzurizaki are implied. After losing affluence, she resides in an attic and undertakes part-time jobs including modeling, though specifics are unelaborated. Across franchise seasons, specials, and spin-offs, she retains core traits while showing subtle growth in confidence and teamwork.