derpy_hooves
Derpy Hooves is a gray and blond pegasus from My Little Pony: Friendship Is Magic.
Her eyes are almost always depicted either wall-eyed or cross-eyed.
She was originally only a background extra who was cross-eyed due to an animation error. Her popularity among the fanbase led to her becoming a minor recurring character.
The show's writers never settled on an official name for her; while Derpy Hooves is the most commonly used name for her in fandom she has also been known as Bubbles, Ditzy Doo, or Muffins in some merchandise.