Hoppy is very playful and friendly and he seems to be very good at boxing, which Fred Flintstone found out the hard way. At first, Fred regards Hoppy as an overgrown, obnoxious nuisance until the day came when the Flintstones and Rubbles are endangered while out on a picnic and Hoppy goes for help. Hoppy becomes good friends with Dino and often helps with babysitting the children.
Hoppy is a Hopparoo with green skin, three black hairs on his head, five black spots on the top of his knees, yellow-tan muzzle on his face, with six light green spikes on his back. Also, he wears a pink or red collar and has a pouch of which he carries Pebbles, Bamm-Bamm, and numerous of other things inside. He gets around by hopping on his hind legs.
- The Flintstones (1964-1966)
- The Man Called Flintstone (1966)
- The Flintstones: The Rescue of Dino & Hoppy (1991)
- The Flintstones & WWE: Stone Age SmackDown! (2015)
- The Flintstones: Bring Back Bedrock
Scriptwriter Warren Foster harked back to his days with the Warner Bros. cartoon unit in the scene where Fred and Dino mistook Hoppy for a giant mouse. Hoppy appeared sporadically through the end of the series and is featured in various Flintstones merchandise.