|Debut||My Little Pony: Friendship is Magic|
Discord is a recurring character introduced in The Return of Harmony Part 1 and Part 2, serving as the main antagonist. Later in the series, Princess Celestia explains that Discord ruled over Equestria in a state of unrest and unhappiness, until she and Luna used the Elements of Harmony to imprison him in stone, until the spell broke after the Elements were no longer connected to the sisters. The word discord means "a lack of harmony" or "a disagreement". And he became an Anti-Hero in Keep Calm and Flutter On.
For the rest of the series, he is a supporting protagonist.