Lulune Louie serves as a supporting character in the film "Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion." A Level 3 adventurer belonging to the Hermes Familia, she possesses distinctive light brown Chienthrope ears and a tail, complemented by black hair and golden eyes. Her attire typically consists of brown shorts, matching boots, a brown jacket worn over a midriff-exposing black shirt, a crimson scarf, black gloves, and a black belt.

Lulune exhibits a carefree and friendly personality, though this often leads to carelessness with sensitive information; she struggles to keep secrets, sometimes revealing confidential Familia details during missions. She expresses noticeable annoyance toward Hermes due to his habit of assigning demanding tasks. Financial rewards strongly motivate her, leading her to accept high-paying jobs such as transporting the Jewel Fetus from the Dungeon.

Her Level 3 adventurer status grants significantly enhanced physical abilities. She fights acrobatically, wielding knives and employing disruptive guerilla tactics. Her combat effectiveness increases when coordinating with fellow Hermes Familia members, showcasing strong teamwork. As a Human Beast, she possesses heightened senses further amplified by her falna and level advancements. Beyond combat, she acts as a skilled cartographer for her Familia, mapping ruins outside Orario.

Within the film's narrative, Lulune participates in the mission to defeat the ancient monster Antares under Hermes' command, alongside members like Asfi Al Andromeda. Operating in the Elsus Ruins region, she assists in reconnaissance and combat operations. Her role includes supporting Bell Cranel's group by helping clear monster infestations and secure pathways toward Antares, contributing to the effort to neutralize the monster and its destabilizing influence on Orario's Dungeon.

No concrete background details, character development, or appearances in other official media beyond the film are documented.