Character: rainbow dash
Rainbow Dash is a pegasus pony with a sky blue body and a rainbow-colored mane and tail. She is very brave and bold, but also mischievous and proud, as well as sometimes being insensitive. She has great speed and works with the other pegasus ponies to move clouds around the sky and adjust the weather. Rainbow Dash's signature move is the Sonic Rainboom, in which she flies fast enough to break the sound barrier, creating a sonic boom and a rainbow at the same time. It is revealed that when she did this move for the first time, she earned her cutie mark and set in motion a chain of events that allowed the other five main characters to earn theirs as well.
According to Mom, the character of Rainbow Dash was designed to be like her favorite first generation pony, Fire Fly. She used the name and general design of the third generation character Rainbow Dash to give the nauseatingly girly and brainless character some redemption. The current version of Rainbow Dash bears little resemblance to her previous incarnation apart from the fact that she too is about as sharp as a bowling ball.
One thing will turn Rainbow Dash into a fangirl, and that is the attention of the Wonderbolts, Equestria's premier stunt flying team. She attended the Grand Galloping Gala with the sole purpose of schmoozing them at the party (Best Night Ever). Her efforts to send the contents of the Ponyville reservoir to Cloudsdale had the dual purpose of impressing Spitfire, the captain of the Wonderbolts (Hurricane Fluttershy). Rainbow Dash has since managed to become a cadet at the Wonderbolts' academy.
Rainbow Dash has a fondness for playing purile pranks as depicted in Griffon the Brush-off and Luna Eclipsed. These pranks frequently involve a jump scare. Occasionally, she will partner with Pinkie Pie to prank her friends.
Twilight Sparkle got Rainbow Dash hooked on young adult adventure novels and particularly on those featuring the Doc Savage-esque Daring Do. Since then, Rainbow Dash has followed the series with a manic passion, irritating her friends and gushing about it like a sperge with Twilight. Since it was revealed that the Daring Do novels were in fact autobiographical (wut), Rainbow has deluged the author A.K Yearling with obnoxious fangasms. Her behavior may be a none too subtle jab by the creators of FiM at the IRL behavior of the creepy barely human horrors who make up a significant portion of their fanbase.
Rainbow Dash has a curiously masculine long-standing personal competition with Applejack. Usually, their rivalry will involve demonstrations of physical prowess, as in Fall Weather Friends, but it also extends to feats of courage and endurance as in Castle-mania. Otherwise, they tend to get along.
Rainbow Dash has a close relationship with Fluttershy, since they were childhood friends in Cloudsdale (see: Cutie Mark Chronicles). She frequently encourages Fluttershy to try scary new things (Dragon Quest, Hurricane Fluttershy). Rainbow occasionally recommends Fluttershy for missions that require cute or exotic costumes(Crystal Empire, Magic Duel). Rainbow has been known to climb into Fluttershy's bedroom while she sleeps, yank the bedsheets off of her, and carry her off into the night. You know, to get cider (Super Speedy Cider Squeezy 6000).
She has an unconventional and not entirely healthy "big sister" relationship with her drooling fangirl, Scootaloo. Rainbow Dash agreed to take the lonely little filly "under her wing" one night on a camping trip, and I swear I'm not making this up (Sleepless In Ponyville). Since then, Rainbow has spent an afternoon with Scootaloo to help her learn to fly (Flight to the Finish).
Rainbow Dash has a pet tortoise that she calls "Tank." Tank frequently wears aviator goggles and flies about erratically with a go-go-gadget helicopter propeller strapped to his shell. Tank hibernates through the winter, although the show creators may be confused about the nature and duration of tortoise hibernation.
Rainbow Dash embodies the Element of Loyalty.
She is voiced by Ashleigh Ball.
Rainbow Dash has a crusty cunt.
"I want to cum inside Rainbow Dash" is a shitty, overused meme.