The Carrotizer Bunny is a human-like Rabbit with the ability to turn anyone he touches into a carrot, which gives him an upper hand despite being physically weak. After his and his henchmen's defeat, the trio are left on the moon by Goku to pound mochi. Their fate is in reference to the Japanese fable of a rabbit said to live on the moon and pound mochi.
In the _Dragon Ball: Adventure Special_ guide book, Akira Toriyama said that since Jackie Chun destroyed the moon, the Carrotizer Bunny and his henchmen are now simply drifting through space (though after the moon returns, they seemingly returned to their prior role as seen in an extra page of _Dragon Ball Super_).
(Source: Kanzenshuu)
