Nachos is a living dragon/motorcycle hybrid. She has dark green scaly skin, long black wings, two long horns that Marco uses like handlebars, yellow eyes, sharp fangs, and spikes on her muzzle and tail. Each pair of her front and hind legs is attached to a spiked wheel. She also wears a neck collar with a tag bearing the number "667".
In "Running with Scissors", Nachos appears as Marco's mounted steed as he travels through Hekapoo's dimension, having met and befriended her sometime in the 16 years he spent there. They ride together to Hekapoo's forge during Marco's quest to blow out her flame. When Marco decides to return to Earth with Star Butterfly after finishing his quest, he and Nachos have a tearful goodbye, and Marco leaves Nachos in Hekapoo's care.
In "Night Life", Nachos appears again, serving as Marco's mount as he and Hekapoo hunt down and close rogue interdimensional portals. In "Booth Buddies", Marco brings her to Foolduke and Ruberiot's wedding. Kelly takes her for a joyride while Star and Marco are trapped in a photo booth, and Marco later uses her to take Kelly home.
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