Serenity

Serenity is the placeholder name of a male background Pegasus pony with a pink coat, dark blue (sometimes bright yellow) mane and tail, grayish blue eyes, and a cutie mark of three raindrops.

Design
Serenity shares his design and cutie mark with "Warm Front" and "Dewdrop", his design with "Starburst", "Cloud Break", "High Note", "Sunlight", and "Silverwing", his mane and tail design and color scheme with "Gingerbread", his mane and tail design and coat color with Ace and S01E21 Unnamed Earth Stallion #10, his mane and tail design and color with "Strawberry Cream", his mane and tail design and eye color with Golden Delicious, Cherry Fizzy, "Black Stone", "Cormano", S04E22 Unnamed Unicorn Stallion #2, "Gary Coronet", and S05E06 Unnamed Earth Stallion #7, his mane and tail design with "Burnt Oak", Caramel, "Black Marble", Royal Riff, Doctor Horse, Wensley, S04E06 Unnamed Earth Stallion #2, S04E06 Unnamed Earth Stallion #5, S04E08 Unnamed Earth Stallion #12, S04E10 Unnamed Unicorn Stallion #1, S04E12 Unnamed Unicorn Stallion #1, S04E22 Unnamed Earth Stallion #1, S04E22 Unnamed Earth Stallion #2, S04E22 Unnamed Earth Stallion #9, S04E24 Unnamed Earth Stallion #4, S04E24 Unnamed Earth Stallion #6, S04E26 Unnamed Earth Stallion #1, S05E05 Unnamed Earth Stallion #1, S05E06 Unnamed Earth Stallion #8, S05E10 Unnamed Earth Stallion #4, and S05E12 Unnamed Earth Stallion #2, and his tail design with "Business Saavy" and S04E08 Unnamed Earth Stallion #10.

Depiction in the series
Serenity first appears in Hurricane Fluttershy as one of the Pegasi helping transport water from Ponyville to Cloudsdale. Throughout his scenes, Serenity's mane color switches between blue and yellow. During the second tornado attempt, Rainbow Dash shouts at him to "flap those wings", and he has a brief speaking role asking "What was that?" when Fluttershy passes him.

Serenity appears later in Rainbow Falls flying about the Equestria Games qualification tryouts in much the same way as his first appearance. In Equestria Games, he flies up with other Pegasi to stop the ice cloud from falling onto the stadium.

In season five, Serenity appears in Tanks for the Memories moving clouds from Cloudsdale to Ponyville for winter.

Depiction in Friendship Games
In My Little Pony Equestria Girls: Friendship Games, Serenity makes a brief cameo flying over Rainbow Falls with Sprinkle Medley in one of Midnight Sparkle's dimensional rifts.

Quotes
"What was that?"

- Hurricane Fluttershy