Twilight Sparkle

Twilight Sparkle is a unicorn pony who is a special and loyal apprentice of Princess Celestia and is the main protagonist of My Little Pony Friendship is Magic. She lived in Canterlot where she studied under the Princess' tutelage, but moved to Ponyville where she now works as a librarian and continues her studies. Twilight regularly maintains correspondence with her mentor through the use of letters. She lives at the town's library along with her young dragon assistant Spike and owl pet, Owloysius. Twilight represents the element of magic, and is Shining Armor's younger sister, sister-in-law to Princess Cadance