Cotton Cloudy

Cotton Cloudy is the placeholder name of a Pegasus filly with a white coat, light blue mane and tail, and lavender eyes. She has a cutie mark of either a blue cumulus cloud or a yellow archer's bow, and sometimes she has no cutie mark at all. Cotton Cloudy also shares her design with "Princess Erroria" and "Tornado Bolt".

Depiction in the series
Cotton Cloudy appears several times in both season 1 and 2 as a background filly. Also, she has a speaking role in Ponyville Confidential.

Cotton Cloudy makes an appearance in Sugarcube Corner during Call of the Cutie with a cumulus cloud cutie mark, in Rainbow Dash's flashback in The Cutie Mark Chronicles, and in Lesson Zero in Twilight Sparkle's horrifying vision of going back to Magic Kindergarten as a unicorn rather than a Pegasus. Cotton Cloudy watches Apple Bloom in The Cutie Pox and Featherweight in Ponyville Confidential with an archer's bow cutie mark. She also appears during Pinkie Pie's Smile Song in A Friend in Deed.

She appears in Pinkie Pride, Simple Ways, Filli Vanilli, Twilight Time, It Ain't Easy Being Breezies, Leap of Faith, and Trade Ya!

Appearances
Times are approximate and taken from videos with no prolonged transition for commercial breaks.

My Little Pony mobile game
While she doesn't appear as a character in-game, "Cotton Cloudy's" name was listed in-game in a partial list of characters that could be won from the Canterlot Balloon Pop minigame, shown shortly after the Canterlot update.