MLP Twilight Sparkle as evil Daybreaker

Daybreaker is a supporting antagonist in the My Little Pony: Friendship is Magic series, appearing as the main antagonist of the Season 7 television episode A Royal Problem, and again in the comic series as the secondary antagonist of the Nightmare Knights saga. She is depicted as the evil alterego of Princess Celestia, the same as Nightmare Moon being the alterego of Princess Luna.