Derpy

Derpy is a supporting background pony with a representation of  "where Waldo" due to her being hidden in the background scene. In the episode, "Parental Glideance" as a filly it shown that Derpy did not have a cross-eyed. In Applejack's flashback in "Where the Apple Lies" Derpy still as a filly was spotted in background at the hospital and wore a bandage over her eyes. As an older pony, she developed a cross-eyed. Derpy appears almost everywhere as background character throughout the seasons. Such as; storm participation, joined in the running of the leaves, visiting markets, Nightmare Night, Hearth Warming, ects. She's recently working a delivery pony. 

Derpy is clumsy and often bumps into things and tends to get confused easily. Like the time when she helped Rainbow Dash with hanging up the banner but ended up wrecking the building due to her clumsiness.  Another time was when she messed up Matilda's wedding invitation. However, she likes giving a helping hoof like how she offers Rainbow Dash her help with the Town hall building, despite the damage already been done by her. She also helped Rainbow Dash and the rest of the Tornado team In "Hurricane Fluttershy".  In the slice of life, she works alongside with Dr. Hooves as his companion. She also have a love for Muffins.

A Pegasus with a light sapphire blueish gray coat and a pale-yellow mane styled like Rainbow's dash. Her eyes colors are golden and cross-eyed.  In her work uniform, she wore a brown cap with the mail company logo on it, a white polo shirt, and her mane is put into a ponytail.

• Helping Rainbow Dash with the Banner. 
• Hoof wrestling with the Mayor after being under a spell.
• Working alongside with Dr. Hooves in "Slice of Life" Episode.
• Wearing a star on her head and take the place of the star on the top of the Christmas tree. 
• She dressed up as a plastic brown bag on Nightmare Night.
• Won the Derby race.
• Got a eye surgery In "Where the Apple Lies"
• Substitute Rainbow dash at the game in "Rainbow Fall"