Draconequus

Draconequus are, whom Princess Celestia describes as "the mischievous spirits of disharmony." The word "draconequus" was coined by Lauren Faust, and it is composed of the Greek word drakon, meaning dragon, and the Latin equus, meaning horse.

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 * —About Draconequus.

Anatomy
A statue of a draconequus is described by Cheerilee in The Return of Harmony Part 1 as creatures with "the head of a pony and a body of all sorts of other things."

Anti-Heroes

 * Discord