Rainbow Swoop

Rainbow Swoop, or Purple Waters, is a background Pegasus pony with a light bluish-purple coat, dark gray mane, sea green eyes, and a cutie mark of a purple, orange, and yellow-striped rainbow. He is not named on the show, but he is named "Rainbow Swoop" with a trademark symbol and "Purple Waters" in different merchandise.

Design
Rainbow Swoop shares his design and cutie mark with Prism Glider, shares his design with Whitewash, Cerulean Skies, Rainbow Blaze, and sometimes "Thorn", shares his mane and tail style with Coco Crusoe, Noteworthy, Goldengrape, Red Delicious, Felix, Apple Cinnamon, "Blue Bonnet", "Baritone", "Cloudy Haze", "Cherry Strudel", "Welch", "Grape Crush", "Harry Trotter", S04E06 Unnamed Earth Stallion #1, S04E08 Unnamed Earth Stallion #8, S04E08 Unnamed Earth Stallion #13, S04E22 Unnamed Earth Stallion #8, S04E22 Unnamed Earth Stallion #11, and S04E24 Unnamed Earth Stallion #8, shares his mane style with S04E08 Unnamed Earth Stallion #2, "Snow Flight", Unnamed Pegasus Stallion #1, Aries, and sometimes S04E20 Unnamed Earth Stallion #5 and S04E20 Unnamed Earth Stallion #6, shares his tail style with "Klein", "Chocolate Haze", "Sterling Silver", Comet Tail, Rare Find, Emerald Green, Bright Bulb, "Written Script", S04E22 Unnamed Unicorn Stallion #3, "Silver Script", "Stormfeather", and sometimes S04E20 Unnamed Earth Stallion #4 and S04E20 Unnamed Earth Stallion #7, and shares his cutie mark with S02E22 Unnamed Pegasus Mare #8 and sometimes Mjölna and Crescent Moon.

Depiction in the series
Rainbow Swoop makes several appearances throughout the series, usually in episodes in which other Pegasus ponies are also featured.

He first appears in Sonic Rainboom, flying through Cloudsdale alongside Compass Star as Rainbow Dash introduces her friends to the city of clouds. He later appears as a participant in the pageant in Hearth's Warming Eve; he helps Pinkie Pie with her costume before the pageant begins, and he appears among other Pegasi during.

In Hearts and Hooves Day, he appears briefly in Apple Bloom's vision of a future Ponyville, flying through a house wall. In Hurricane Fluttershy, Rainbow Swoop is one of the Pegasi enlisted by Rainbow Dash to help transport water to Cloudsdale. In Wonderbolts Academy, Rainbow Swoop appears in multiple shots as a Wonderbolts cadet, running drills with "Sunburst", "Thorn", and Whitewash.

Rainbow Swoop appears in numerous shots in Rainbow Falls, flying in the background with Orange Swirl, Prism Glider, and/or "Bon Voyage", and he is also on a qualifying Equestria Games aerial relay team with Orange Swirl and Rainbowshine. He is also seen in Pinkie Pride, watching the Goof Off between Pinkie Pie and Cheese Sandwich and later at Rainbow Dash's birth-iversary party. In Equestria Games, Rainbow Swoop takes part in the titular sporting event with his teammates.

A wingless version of Rainbow Swoop appears in The Super Speedy Cider Squeezy 6000.

Appearances
Times are approximate.

Other depictions
A translucent mini-figure toy of Rainbow Swoop was released as part of the tenth wave of mystery pack toys and collector cards and named with a trademark symbol. The collector card depicts him with Soarin's design and states that he "loves to fly over rainbows as fast as he can!"

In the Canterlot Nights expansion set of Enterplay's collectible card game, Rainbow Swoop is named "Purple Waters" on his own card #41 C, which gives him the description "Purple's albums such as 'The Fence' have made him legendary in Equestria. Singing evocative lyrics like:  ' ...and when DJ-Pon 3 [sic] starts spinning different tunes, I'll see the Dark Mare of the moon. '  leaves everypony hoof-stomping for more!" Enterplay's May 13, 2014 Canterlot Nights card list lists card #41 C as "Full Spectrum, Prismatic Pony" instead of "Purple Waters, Prismatic Poet/Musician".

Quotes
"...and when DJ-Pon 3 starts spinning different tunes, I'll see the Dark Mare of the moon."

- Enterplay collectible card game Canterlot Nights expansion set card #41 C of Purple Waters