Rainbow Dash, is a rude, foul-mouthed pegasus with a masculine voice. She might also be a lesbian, as her cutie mark consists of two pink female symbols overlapping.

Rainbow Dash first appeared watching Applejack eating a lot apples out of a wooden tub, telling her that she'll get a "wicked bad tummy-ache." When Pinkie Pie showed up, she told Applejack the same thing as Rainbow flew up next to her and joked about it. When Applejack put herself in a coma from eating all of the apples.