Trixie, or Trixie Lulamoon, is a female unicorn pony and traveling magician. She tends to speak in the third person and refer to herself as "The Great and Powerful Trixie".
In Boast Busters, Trixie assumes a very theatrical personality and speaks dramatically in the third person, posing and setting off fireworks to complete the full effect.
Twilight Sparkle's positive, helpful, and humble attitude is contrasted by Trixie's over-the-top boasting and arrogant nature. Trixie claims to have saved Hoofington from an attack by an ursa major. However, when confronted by an ursa minor, she admits that her tale was fabricated and that even the ursa minor was an opponent far too powerful for her to contain. It's at this point where Trixie drops her "Great and Powerful" persona. Despite this brief display of honesty and fear, her frequent showboating alienates the other ponies.
In Magic Duel, Trixie returns with her magic augmented by the Alicorn Amulet, and she uses this power to take revenge on Twilight in a magic duel, banishing her from Ponyville and subsequently setting herself up as the leader of the town. She shows no qualms about using innocent ponies such as Snips and Snails to prove her power. During the episode, Trixie keeps Mayor Mare in a cage and forces other ponies to do manual labor for her. However, upon the Amulet's removal and the loss of her power, she accepts her defeat against Twilight and meekly seeks forgiveness for how she treated her and her friends. At the end of the episode, Trixie once again drops her persona and speaks in the first person before referring to herself as the "Great and Apologetic Trixie". In No Second Prances, Trixie gives magic shows across Equestria as part of her "apology tour", bonds with Starlight Glimmer over their similarly troubled pasts, and shares with her deep secrets about herself.