The protege student of Princess Celestia, and an expert in magic. She was first sent to Ponyville to make friends - a task that opened her eyes to the greatest magic of all.
Most unicorns' magic revolves around their special talent, usually displayed via cutie mark - but Twilight Sparkle's talent IS magic! As such, she knows a wide array of different spells. She can even memorize a spell's workings on sight!
She is the most recent princess in Equestrian history, a paragon of sorts.