First introduced as an unreliable-narrator during some of The Darkness II's promotional trailers, Johnny is what one could call a 'scholar', though with his primary focus of study being The Darkness. It's through this dedication that has left Johnny somewhat insane--disturbed at best--living life under a bridge. Regardless of the toil that has been taken on his mind, Johnny is still a surprisingly intelligent individual.
While not officially apart of Jackie's Mafia Family, Johnny aids Jackie with information concerning The Brotherhood, and regarding the violent and long-lived past of The Darkness itself. Most notably, Johnny will narrate the lengthy history behind the occult Darkness-related collectibles the player can find across the story.