Sea Swirl

Sea Swirl is a female unicorn pony with a lilac coat, iris mane and tail with a light glaucous streak, raspberry rose eyes, and a cutie mark of two encircling dolphins; one light glaucous and one iris. Her name has not been used on the show, but she is named in merchandise. She shares her design with Minuette. Sea Swirl has a speaking role in The Cutie Pox, and she says "Mmmmmm, muffins" along with other ponies in Applebuck Season.

Depiction in the series
Sea Swirl is commonly featured as a background pony. She makes her first appearance in episode 1 at the surprise party that Pinkie Pie throws for Twilight Sparkle in the Ponyville library. In Cutie Mark Chronicles, she stands on a cloud in the sidelines of the race track in Fluttershy and Rainbow Dash's flashbacks of flight camp, even though she is not a pegasus pony—it was stated by Rainbow Dash in Sonic Rainboom that only pegasus ponies can stand on clouds. However, as proved by Twilight Sparkle in the same episode, a spell exists that enables non-pegasus ponies to accomplish the feat, making the circumstances around Sea Swirl's station in Cutie Mark Chronicles much more plausible.

She appears in a bowling alley in The Cutie Pox. She has her first speaking role when she makes an exclamation about "a bowling cutie mark", which a colt earns in the scene. In A Canterlot Wedding - Part 2, she is one of twelve horn-blowing unicorns at the wedding during This Day Aria.

In Sweet and Elite, a background pony that shares Sea Swirl's coat, mane, and eye color, and tail design is seen as a part of Fancy Pants' entourage of noble ponies at the Wonderbolts Derby and again at the Canterlot garden party.

Appearances
Times stated below are approximate and taken from videos available online.

Merchandise
A mystery pack toy named Sea Swirl was released in January 2012. The toy uses the Rarity mold but features Sea Swirl's color scheme—albeit with red-orange eyes instead of rose—and cutie mark. Her name comes from the card accompanying the toy. According to the European toy package, Sea Swirl "loves the sea". The U.S. mystery pack toy package has a longer description and reads, "SEA SWIRL loves to go swimming in the ocean!"

Quotes
"Cool! A bowling cutie mark!"

- The Cutie Pox