Derpy Hooves

Derpy, also known as Muffins and Ditzy Doo, is a female Pegasus pony who was given the name Derpy Hooves by the show's internet following due to her cross-eyed "derpy" expression in the first episode. The name has since been adopted by the crew and Hasbro. Starting with Feeling Pinkie Keen, the show's crew began giving the pony crossed eyes intentionally and later gave her "Where's Waldo" type cameo appearances as a nod to the fans.