Galaxy Fraulein Yuna

Galaxy Fraulein Yuna (銀河お嬢様伝説ユナ), is a series of video games, anime, and other media from Japan. The Japanese title literally translates to "Galaxy Lady Legend Yuna".

The main character of the series is Kagurazaka Yuna, a somewhat ditzy
16-year old girl. After winning a "Galactic Bishōjo Contest",
she becomes "Savior of the Lightside", a magical
girl charged with defending the universe from evil. After becoming the "Savior
of the Lightside", Yuna gains an impressively powerful armored suit, however,
her greatest strength lies in her ability to befriend anyone, even her enemies.
Her group of comrades (which is extensive) is comprised almost exclusively
of former opponents. (Wikipedia)