Johnny Elaine is a major character who appears frequently in the show. He technically appears in every episode as he appears in the theme song. His name is revealed in the video game Battle for Bikini Bottom, where he is the announcer for the main boss fights. He makes his first in-series appearance in the episode "Mermaid Man and Barnacle Boy II."
In Battle for Bikini Bottom Johnny Elaine narrates all of the boss battles.