Tank

Tank is a tortoise that became Rainbow Dash's pet in the episode May the Best Pet Win!. He is mainly shown to be slow to move and react, much in stark contrast with the fast in impatient Rainbow Dash. Despite this, the two of them is generally seen to be close friends, and Tank also has a helicopter suit he can use to follow Dash. Tank is often compared to the tortoise in the classical fable "The Hare and the Tortoise" due to him triumphing in Rainbow Dash's pet race despite his slowness and is often shown to be both wise and dependable.

A popular meme about Tank comes from the general mistake several of the characters makes about him in his debut episode, calling him a turtle despite being a tortoise and then being corrected by Fluttershy. Tank being a tortoise that can fly has made him popular in poetry and similar works of fiction.