From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Johnny is the son of Johnny's Mother.
Johnny lived in Aru Village. When Son Goku fought against Oolong, he got angry and shot a slingshot at the back of Oolong's head (who was in the form of a robot at the time). Johnny's Mother grabbed him and ran away saying, "Johnny, do you wanna get yourself killed?"
He is named Villager I in Dragon Ball: Origins.
- Johnny may have been an inspiration for Pansy from Dragon Ball: Curse of the Blood Rubies as they both use a slingshot to attack Oolong.