Nanoha Takamachi/Bio & Battles

Originally a minor character in an esoteric Japanese dating sim, Triangle Heart, Nanoha Takamachi is the main character of the Magical Girl Lyrical Nanoha series.

Nanoha was girl in the city of Uminari, Japan, until, at eight years of age, she finds a magical artifact, an "intelligent device" known as "Raising Heart" which takes the form of a red jewel in a necklace capable of transforming into a staff capable of firing devastating energy attacks along with a talking ferret named Yuuno. Yuuno reveals to her that "magic" is actually an alien technology, and that she is one of the few humans capable of using it. The ferret then tells her of his own mission, to recover dangerous magical artifacts known as Jewel Seeds. She later encounters another magic user, a humanoid alien named Fate Testarossa, who is also seeking the Jewel Seeds for her own purposes. Despite initial hostilities, Nanoha defeats, befriends, and frees Fate from her abusive mother, and the two quickly become close.

A few months later, Nanoha gets involved with the Wolkenritter, magical constructs created by the artifact known as the Book of Darkness. She reunites with Fate to fight the group, who are draining mages of their ability to use magic in order to power the artifact. While they are successful, outside forces intervene to power the Book of Darkness, which then goes berserk. After a battle, they manage to weaken it enough to free its host, Hayate Yagami, who goes on to join Fate and Nanoha as a trio of powerful mages.

Years later, Nanoha leaves Earth to work for the Time-Space Administration Bureau, an organization that polices the use of magic. As one of the organization's strongest mages, she quickly rises in the ranks, and fills the role of a combat instructor when she isn't on the front lines. She is then roped into Riot Force 6 by Yagami, where she and Fate form the core of the team. While foiling a coup, Nanoha rescues and adopts Vivio, the clone of an ancient ruler.