The show's title is a play on the word kappamaki, a type of sushi. It is suggested that the show was the inspiration for naming the title character "Mikey" and used the prefix "kappa". Like Mikey, who is a "fish out of water" in Japan, the kappa itself is a water demon creature who can live on land. The kappas first appeared on this show in the episode "Mikey, Kappa" on August 5, 2007, where the origin of the title was explained. Coincidentally, Mikey also shares his name with the actor who supplies his voice.