, better known as , is a Japanese superheroine and the main protagonist and title character of the Sailor Moon manga series written by Naoko Takeuchi and its subsequent media adaptations. She is introduced in chapter #1, "Usagi – Sailor Moon" (originally published in Japan's Nakayoshi magazine on December 28, 1991), as a carefree Japanese schoolgirl who can transform into the magical "Guardian of Love and Justice", Sailor Moon. Across all adaptations of Sailor Moon, Usagi initially meets Luna, a magical talking black cat who is searching for the Moon Princess. Luna reveals that Usagi is destined to save Earth from the forces of evil and gives her a brooch to transform into Sailor Moon. She asks Usagi to locate the other reincarnated Sailor Guardians, find the princess and protect the "Silver Crystal", an item of immense power. After locating her comrades, Usagi later discovers that she is the reincarnation of the Moon Princess, and that her former lover, Prince Endymion of Earth has also been reincarnated in the present as the mysterious hero, Tuxedo Mask. As Usagi matures, she becomes a powerful warrior and protects her adopted home planet, Earth, from villains who wish to harm it. Usagi is depicted as usually carefree and cheerful, but with cry-baby tendencies that show themselves when things do not go her way. As the protagonist, Usagi appears in every episode, film, video game, and television special of the anime adaptations, Sailor Moon and Sailor Moon Crystal; as well as the live action adaptation, Pretty Guardian Sailor Moon, with her trademark twin buns with twin pigtails. She also cameos in the sister series Codename: Sailor V. She has been the subject of parodies and has appeared in special events. Usagi's critical reception has been largely positive and she is recognized as one of the most important and popular female superheroes of all time, and a cultural symbol of Japan. Conception and creation Usagi and Sailor Moon series evolved from Naoko Takeuchi's earlier one-shot series called Codename: Sailor V. In Takeuchi's first proposal for the Sailor Moon series, each of the five heroines had a completely unique outfit. It was eventually decided that they would instead wear uniforms based on a single theme, whose design was closest to Sailor Moon's original costume concept. Sailor Moon's original had some small differences, including color changes, an exposed midriff, and ribbons around the gloves and boots. She