The character "Lune" does not appear in an anime titled "The Princess and the Moon," but multiple characters named Luna or Lune exist across other media.

Princess Luna from *My Little Pony: Friendship Is Magic* is the younger sister of Princess Celestia and co-ruler of Equestria. A thousand years before the series, jealousy over neglected nights transformed her into Nightmare Moon, leading to banishment on the moon via the Elements of Harmony. She escapes in the premiere to impose eternal night but is defeated by Twilight Sparkle and friends, restored to her original form. Luna initially struggles with archaic speech and social barriers in modern Equestria, reconciling her past during the holiday Nightmare Night. She later guards the dream realm, aiding ponies against nightmares, and retires alongside Celestia in the finale, passing rulership to Twilight. In *My Little Pony: The Movie*, Luna prepares the Friendship Festival, turns to stone during the Storm King’s attack, and is restored after his defeat. Her human counterpart, Vice Principal Luna, appears in *Equestria Girls* as the strict but fair vice principal of Canterlot High School, working with Principal Celestia. Luna features in comics and merchandise, designed with a dark blue coat and starry mane. Early development named her "Princess Selena," changed to "Luna" for legal reasons.

Luna in *Sailor Moon* is a talking black cat with a crescent moon on her forehead, mentoring Usagi Tsukino (Sailor Moon) by granting transformation items and guiding Sailor Guardians’ awakenings. Originating as an advisor to Queen Serenity in the Moon Kingdom, she reincarnates on Earth with suppressed memories to protect the Guardians. Her backstory includes a romantic bond with the white cat Artemis, resulting in a future daughter, Diana. Luna detects evil energy, summons magical items, and reawakens powers. In the live-action series, she becomes human as Luna Tsukino and transforms into Sailor Luna, Guardian of Love and Small Things, using a cell phone for powers while retaining cat-like traits like heightened hearing and aversion to dogs.

Other characters named Lune include:
- A horned devil from *Villains Wiki* with masochistic tendencies and executive duties in Vintage.
- "Princess of the Moon," an open-source character inspired by Moon Girl, tied to warrior Amazons and lunar powers.
- A valkyrie in *Olivia: Princess Knight* depicted with armor, a spear, and blonde hair.
- Queen of the Unseelie Court in *Dreamwalker Saga*, ruling for millennia and fostering alliances between faerie courts.