Discord

Discord is an antagonist who is set to appear in The Return of Harmony, part 1 and part 2. Once Discord escapes from his stone prison, Twilight Sparkle and her friends must act quickly to summon the Elements of Harmony in order to stop him.

Wired.com preview
Wired.com posted a preview of season two's first episode, The Return of Harmony, part 1. In the clip, the six main ponies come across a labyrinth, where they are confronted by Discord who magically takes their wings and horns as part of "a game".

Trivia



 * Discord means "a lack of agreement or harmony between things", or "disharmony".
 * He is a draconequus composed of a bat wing, a pegasus wing, a snake tail, a griffon body, an eagle left arm, a lion right arm, a horse head, one fang, a deer left leg, a dragon right leg, an elk horn, and a chinese dragon horn. He also has different sized pupils.
 * Much like John de Lancie's popular character Q on Star Trek: The Next Generation, Discord appears with a bright white flash, and the two even share some mannerisms, including a fondness for "games".