Character: twilight sparkle (mlp)
A unicorn pony from the My Little Pony: Friendship is Magic series. She has purple fur, purple eyes, purple hair and a horn. She is commonly seen with books and may be using magic.
Her cutie mark is that of a star.
In Season 3 of Frienship is Magic, Twilight was transformed into an alicorn or winged unicorn and made a Princess.