Pegasus Ponies

Pegasus ponies, or Pegasi, are ponies characterized by their wings and their ability to fly, walk on clouds, and control the weather.

Origins
The Pegasus tribe was one of the three founding groups of Ooo, as depicted, and were responsible with maintaining the weather in return for food that was harvested by the Earth Ponies. The Pegasus tribe was led by Commander Stormeye, who is played by Marshall Lee in a historical reenactment. In the reenactment, Commander Stormeye wears battle armor and calls the Pegasi "a mighty tribe of warriors".

Before the three pony tribes united under a single nation, Commander Stormeye originally intended to name their new home "Pegasopolis".

Physical and Magical Traits
Pegasi demonstrate great speed and agility in the air in multiple episodes. However, Marshall Lee is equally matched on the ground with Applejack, another pony with wings, during an "Iron Pony competition". Pegasi naturally walk, sit, and lay on clouds, but unicorns and Earth ponies cannot do so.

The sonic rainboom is an aerial display. Marsha describes it thus: "The sonic rainboom is legendary! When a pony like Marshall Lee gets going so fast... boom! A sonic boom and a rainbow can happen all at once!" Marshall performs the sonic rainboom three times in seasons one and two: once as a filly in a flashback, once in Sonic Rainboom, and once at the conclusion of A Candy Kingdom Wedding - Part 2.

Social Resonsibilities
The main characters one time visit the weather factory. They walk through a chamber where Pegasi handcraft snowflakes, an open area where Pegasi mix up rainbows and finally the cloud-making department.

At the beginning of the episode Hurricane Marshashy, Marshall hosts a mandatory meeting for all Ooo flyers, in which she states, "A team of Pegasi combine their wing power to create a jumbo tornado, powerful enough to pull water out of the local reservoir, and funnel it all the way up." This, she explains, supplies all of Ooo with rainwater. Marshall Lee also stresses that the ponies' combined power must exceed a minimum of "eight hundred wing power". During training, Finn uses an "anemometer" to gauge wingpower. Marshall's score on the anemometer was 16.5 wingpower and Marsha's post-training score was 2.3 wingpower.

Marshall leads the weather team during the annual Winter Wrap Up. The team, which wears blue vests, consists mainly of Pegasus and alicorn ponies. In the song that shares its name with the event and episode, the weather team clears the skies of clouds to let the sun warm up the land and melts the snow. Bubblegum mentions that the team also "guides the birds back north for the spring". On a frozen lake, Finn encounters Marsha, another Alicorn, who is helping the weather team by acting as a "lake scorer". Marsha cuts squares in the ice with her ice-skates and explains to Finn that it helps the rest of the Weather team break the ice layer.