Cotton Cloudy is a Pegasusfilly 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 with nocked arrow, and sometimes she has no cutie mark at all. The show does not name her, but Gameloft's mobile game has listed her name in-game and included her in its files.
7:05, 7:08 - playing on the swings with "Princess Erroria"; 7:23, 7:46 - admiring Apple Bloom's cutie mark; 8:28 ~ 10:19 - admiring Apple Bloom's loopty-hooping; 10:32 - next to "Dinky Doo"; 10:33 - next to "Ruby Pinch"; 11:05 - looking surprised; 11:09, 11:19 - watching Apple Bloom spin plates; 11:41 ~ 12:24 - watching Apple Bloom's talents
0:06 - leaving Ponyville Schoolhouse; 0:16 - admiring Featherweight's cutie mark; 6:20 - reading the Foal Free Press; 6:39 - on the swings with "Dinky Doo"; 8:53 - on the playground with "Tornado Bolt"; 19:37 - reading the Foal Free Press; 20:53, 21:15, 21:18 - in the press room
2:55 - walking with "Dinky Doo"; 3:02, 3:04, 3:40 - watching Diamond Tiara's display; 4:16 - in Sweetie Belle's fantasy; 8:19 ~ 9:19, 12:57 - admiring the Cutie Mark Crusaders; 10:03 - hiding with other foals in the bushes; 11:24 - watching Twilight from outside the Hay Burger; 11:54 ~ 12:19, 15:44, 16:01 - admiring Twilight Sparkle; 13:20, 13:44 - catering to the Crusaders; 14:19 - outside Diamond Tiara's front gate; 14:46 ~ 15:35 - part of an angry mob of foals; 16:56 ~ 18:17 - with Twilight and other foals in the Golden Oak Library
2:23 - watching Diamond Tiara talk about Twist; 2:33 - being approached by Diamond Tiara; 3:23 - watching Pipsqueak on the horseshoe structure; 5:09 - standing next to "Aura" (blank flank); 5:57 - cheering for Pip; 6:29 - standing behind "Princess Erroria"; 6:35 - awaiting the results of the election; 7:10 - awaiting Diamond Tiara's reaction; 10:41 - stampeding out of the schoolhouse; 16:45 - standing next to Tornado Bolt; 19:00 - flying in between Miss Cheerilee and Button Mash; 20:25 - standing next to Berryshine; 21:25 - flying with Fluttershy for a group photo
7:01 - watching the race (re-used shot from The Cutie Mark Chronicles); 7:41 - cheering on the Boy Bullies who end up winning the race due to Starlight Glimmer's meddling; 15:37 - flying in Cloudsdale back in the past
0:12 - running with "Liza Doolots"; 0:44 - building a snowpony outside the Castle of Friendship; 5:16, 6:11 - caroling outside Snowfall Frost's window; 9:50 ~ 10:10 - playing with "Liza Doolots", "Dinky Doo" and filly Snowfall Frost; 11:33 - running with Liza Doolots and "Dinky Doo" towards Snowfall's classroom window; 19:03 - standing with the same carolers from earlier
While she doesn't appear as a character in Gameloft's mobile game, her fan-given name was listed in-game in a partial list of characters that could be won from the Balloon Pop minigame, shown shortly after the Canterlot update, and the game's files include two character model files with the string "cottoncloudy" in their names as well as a quest menu icon depicting her. The character did not appear in-game because of "a problem with character naming".