In Mahou Shoujo Madoka Magica, this is an alternate persona of Kaname Madoka.
She has long pink hair with white ribbons, golden eyes, and has wings. She wears a frilled, white dress, pink thighhighs and white pumps.
It is the form Madoka takes in the final episode of the anime, unleashing the full power of her magic potential accumulated over multiple timelines to become an incredibly powerful, goddess-like being. Sometimes called "Madokami" or "Godoka" by fans.