Johnny 13 is a classic '50s biker with bad luck. His shadow, which has a life of its own, spreads this luck to others. He has a girlfriend, Kitty; his main motivation is to be left alone with her. However, when he starts getting bored, his shadow starts causing trouble, and Danny starts to get in his way. His shadow is very brutal, although it is easily subdued by light.
Johnny has ghost powers (invisibility, overshadowing, flight, and intangibility), but Johnny usually prefers to cause mayhem on his bike which can fire blasts from its headlight. His main ability is to summon his shadow to stop his enemies.
He however cannot do much without his Shadow and is always sidetracked by other girls. Shadow, meanwhile, has two primary weaknesses: bright lights, which cause it to disintegrate, and water, which reduces it to a puddle of black slime.