She is the primary main character of My Little Pony Friendship is Magic. She is a female unicorn pony who transforms into an Alicorn and becomes a princess in Magical Mystery Cure. She is also the younger sister of Shining Armor and sister-in-law to Princess Cadance.
Twilight Sparkle represents the element of magic. Before becoming a princess, she regularly sends friendship reports to Princess Celestia. In Owl's Well That Ends Well, Twilight adopts a pet owl named Owlowiscious.