Derpy or Ditzy Doo is a light bluish-gray Pegasus who was given the name Derpy Hooves by the show's internet following due to her having a 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. The character is addressed by Rainbow Dash in The Last Roundup as Derpy, where she speaks for the first time. The scene was later altered so Rainbow no longer names Derpy, in addition to her voice being altered and eyes being less crossed.
- She is called Muffins in some Merchandise.