Luna hails from the Moon Kingdom, where she advised Queen Serenity and Princess Serenity throughout the Silver Millennium. After the Dark Kingdom’s assault destroyed their realm, she and Artemis entered suspended animation, journeying to Earth to mentor the reincarnated Sailor Guardians. Tasked with safeguarding the Silver Crystal and identifying the Moon Princess, Luna’s memories were selectively muted to prioritize awakening the inner Solar System Guardians, though her core mission remained intact. In her feline form, Luna manifests as a sleek black-purple cat with a glowing yellow crescent moon on her forehead. Her eyes shift between red in the original anime and blue in manga, live-action, and Crystal adaptations. She exhibits enhanced agility, conjures magical tools like Transformation Pens and the Moon Stick, and senses malevolent forces through physical cues like shivering. The crescent moon illuminates when reactivating Guardian abilities or during flashes of past-life memories, such as Princess Serenity’s resurgence. The manga side story *The Lover of Princess Kaguya* introduces Luna’s human guise: long black hair styled in odango buns, accented by her signature crescent mark. Initially sustained by the Silver Crystal’s energy, this form later stabilizes permanently. *Sailor Moon Eternal* streamlines her design with a shorter black skirt, mirroring the manga’s Dream arc. The live-action series reimagines her as a plush toy transforming into Luna Tsukino, a human girl employing candy-themed attacks and a versatile Moonlight Stick that shifts into items like a fan. Beyond guiding the Guardians, Luna probes mysteries like Tuxedo Mask’s identity and exchanges covert messages with Artemis through arcade games. Stern yet nurturing, she challenges Usagi to mature while masking personal vulnerabilities, including a crush on Kou Yaten in *Sailor Stars* and unspoken affection for Artemis. Their bond eventually leads to marriage, resulting in a daughter, Diana, who assists Chibiusa. *Sailor Moon SuperS* explores familial tensions when Diana’s parentage is briefly questioned. *Sailor Moon Crystal* and *Eternal* showcase Luna’s human form during critical battles—praying on the Moon against Queen Metalia or aiding allies after Queen Nehelenia’s defeat. These films delve into her species’ roots on Planet Mau, home to Sailor Tin Nyanko, and highlight her near-Sailor Crystal-level Star Seed, cementing her importance beyond mentorship. Adaptations consistently frame Luna as a loyal strategist, though nuances vary: the manga and Crystal present her human form as physically delicate, while the live-action series injects humor through quirks like reverting to plush form mid-sneeze. Collectively, her arc transitions from disciplined mentor to a layered figure harmonizing duty with emotional depth.