Princess Luna of the Mirror (Dupluna)

Midnight and you arrive without making a sound
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Dwelling in darkness: Unlike Princess Luna, who managed to reform in Equestria, Dupluna is a Mirror-native alicorn who allowed herself to be consumed by bitterness and remained on the side of the villains. Proud and dramatic: She inherits Nightmare Moon's overconfidence, exaggerated decorum, and dramatic flair. Solitary hobbies: She possesses an unusual and curious side: instead of constantly seeking to conquer kingdoms, she is known to have developed a particular fondness for playing the organ. Alternate royalty: She rules alongside an evil version of Princess Celestia (sometimes called Festia or Fauxlestia) and is often accompanied by other sinister versions of ponies, such as Humble Trixie.