Johnnie-O is a young, roughly pre-teen boy who died sometime in the early 1920s or 30s. His most distinctive feature are his disproportionately large hands. Up until Everwild, he has a cigarette.
Initially an antagonist, he teams up with Nick in Everwild. In Everfound, he is trapped in the Hindenburg with Speedo, and eventually drives it into the portal to the afterlife.