Nanoha Takamachi

Originally a minor character (protagonist's younger sister) of in an esoteric Japanese dating sim, Triangle Heart. Nanoha Takamachi saw her main debut when her creators decided to (as other visual novel creators have) turn Nanoha into a "magical girl" in a spinoff series. However, this spinoff series become more popular than the original. In the spinoff series, at eight years of age, Nanoha 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. Raising Heart reveals to her that "magic" is actually an alien technology, and that she is one of the few humans capable of using it. She later encounters another magic user, a humanoid alien named Fate Testarossa. Nanoha and Fate are initially hostile, until Nanoha defeats fate and the two subsequently become close friends. A subsequent series describe Nanoha's battle free a girl named Hayate Yagami from the grip of an evil artifact known as the "Book of Darkness". A third anime season features a 19-year old Nanoha as part of a magical military organization known as the Time-Space Administration Bureau. Nanoha has spawned a couple internet memes, her fan nickname of "The White Devil" for her costume appearance that is similarly colored to that of a mecha from the Gundam series. The fact that Nanoha's enemies end up becoming her friends has led to the meme of "Your going to get befriended!", in this case, "befriend" meaning to blast with powerful energy attacks.