Lulune Louie is a Chienthrope, distinguished by light brown animal ears and a tail. Her features include black hair, brown eyes—occasionally noted as yellow or golden—and a teenage appearance. She typically wears brown shorts, matching boots, and a brown jacket over a midriff-baring black shirt, accessorized with a crimson scarf, black gloves, and a black belt.

As a Level 3 adventurer in the Hermes Familia, she exhibits physical prowess far exceeding lower-level adventurers and non-combatants. She employs an acrobatic knife-based fighting style, excels in guerrilla tactics, and demonstrates heightened coordination with Familia allies. Her Chienthrope senses, naturally acute, further sharpened with her Falna and level advancements. Beyond adventuring, she maps ruins outside Orario as a cartographer.

Lulune’s personality is outwardly carefree and friendly, though prone to careless disclosures of sensitive information. This nearly compromised the Hermes Familia’s true capabilities during a mission to the Pantry on the 24th floor, where she almost revealed critical intelligence to Ais Wallenstein before Asfi Al Andromeda intervened. She openly resents Hermes for his operational methods and excessive demands, yet pursues high-risk assignments like transporting the Jewel Fetus for substantial financial rewards.

Her key involvements include the Pantry expedition, where Loki Familia members Lefiya Viridis and Bete Loga assisted under Hermes’ arrangement. In Rivira, she became embroiled in an Evilus-orchestrated murder investigation and monster attacks, initially fleeing Loki Familia members but later collaborating with them against summoned plant monsters. Lulune is 18 years old during the main timeline.