Sailor Moon

Usagi Tsukino, better known as Sailor Moon, is a fictional superheroine who is also the protagonist and titular character in the Sailor Moon manga series written by Naoko Takeuchi. She is introduced in chapter #1, "Usagi - Sailor Moon", originally published in Japan's Nakayoshi on December 28, 1991, as a carefree schoolgirl who can transform into Sailor Moon, the de facto leader of the Sailor Soldiers. She is initially believed to be an Earthling, but is later revealed to be the princess of the moon kingdom Silver Millennium. She later discovers her birth name, Princess Serenity. In Sailor Moon, Usagi is an underachieving schoolgirl who lives in Tokyo. She meets Luna who is searching for the Moon Princess. Luna discovers that she is destined to save Earth from the forces of evil and gives her a broach to transform into Sailor Moon, and asks her to form the Sailor Soldiers, find their princess and protect the "Legendary Silver Crystal." As Usagi matures, she becomes one of the universe's powerful warriors and protects her adopted home planet, Earth, from villains who wish to harm it.