Twilight Sparkle

A unicorn pony with a lavender body, violet eyes and a dark indigo mane and tail in a hime cut with pink and purple streaks running through them. 

Extremely gifted with magic, she is Princess Celestia's Favorite Student, and she once considered study more important than friendship. When in danger from Nightmare Moon's prophecy, Princess Celestia sent her to Ponyville to learn the importance of friendship, which unlocked the fabled Elements of Harmony within her new friends, leading to the defeat, and redemption of Nightmare Moon. She decides to stay in Ponyville and study friendship with her mentor's blessings, accompanied by her assistant, a young dragon named Spike.