TV-Series
Description
Jilk Fia Marmoria is a noble of Holfort Kingdom and foster brother to Crown Prince Julius Rapha Holfort. As part of the Prince's Entourage, he wields influence at the academy, his actions consistently driven by deep loyalty to Julius.

He possesses distinctive green hair and green eyes, typically attired in the academy uniform: gray pants, black shoes, a light blue shirt, red tie, and black blazer. Outwardly controlled and reserved, Jilk masks a calculating nature. This duality manifests in his willingness to employ ruthless methods—sabotage, illegal weapons, and manipulation—to protect Julius's interests or secure victory. Notably, during a pivotal duel against Leon Fou Bartfort, Jilk conspired with Jenna Fou Bartfort to plant explosives on Leon's mech, Arroganz.

His background aligns with the otome game's original storyline as one of five capture targets for protagonist Olivia. However, deviations occur: Marie Fou Lafan's early capture of the targets accelerates conflicts, and Leon's interference as a "mob character" alters events. Jilk participates in key incidents, like a dungeon exploration where he helps repel giant ant monsters alongside Julius's group. His antagonism towards Leon peaks during the End-of-Term Party duel, where he represents Marie against Angelica Rapha Redgrave. After suffering a humiliating defeat and public blackmail by Leon—who recorded Jilk's threat against Leon's family—Jilk is disinherited alongside the entourage. This forces him into financial hardship, compelling dungeon exploration for income.

Post-disinheritance, Jilk's decision-making deteriorates. He and the entourage prioritize short-term gains or revenge over practicality, such as pooling resources to create composite armor from their damaged mechs to challenge Leon again. This scheme backfires, worsening their financial strain and highlighting their growing incompetence. During the academy festival, Jilk operates a café competing with Leon's and enters an airbike race. Sabotage by Clarice's followers injures him; Leon later replaces him in the finals, extracting a favor Jilk repays by mediating between Clarice and her estranged fiancé.

Jilk's loyalty to Julius remains constant, leading to reckless choices like aiding Julius's ill-conceived palace escape plan. Their request for disguises (cloaks and masks) is easily intercepted by Queen Mylene, underscoring their declining strategic acumen. In later arcs, Jilk's role diminishes as his actions increasingly align with the entourage's collective folly, particularly in their pursuit of Marie's approval and rivalry with Leon.

Relationships define his trajectory: unwavering devotion to Julius veers into fanaticism; his dynamic with Marie involves mutual dependency, with Jilk initially viewing her as a means to maintain status; his rivalry with Leon evolves from strategic opposition to one-sided resentment after repeated defeats. His established patterns persist without significant development in spin-offs or later game arcs.