Which pegasus pony sports a rainbow mane and loves speed?

The pegasus pony with a rainbow mane who loves speed is Rainbow Dash.

Rainbow Dash is one of the six main ponies in My Little Pony: Friendship Is Magic. As a pegasus, she has wings and can fly, and she is famous for her athletic ability, competitive spirit, and ambition to become one of the fastest flyers in Equestria.

Her rainbow-colored mane and tail are her most obvious visual features, while her cloud-and-rainbow lightning cutie mark reflects her speed and aerial talent. Rainbow Dash represents the Element of Loyalty and lives in a cloud home above Ponyville. She is also associated with the Wonderbolts, Equestria’s elite flying team, eventually joining them after years of training and competition.

The other options are also pegasi or flying characters, but none is the central rainbow-maned speedster. Spitfire is a Wonderbolts captain, Soarin is another Wonderbolt, and Lightning Dust is a talented but reckless flyer who competes with Rainbow Dash in the episode “Wonderbolts Academy.”