Ghost Rider

Johnny Blaze, a motorcycle stunt performer in a traveling circus, sold his soul to who he believes was Satan but actually is the demon Mephisto (a retcon), in order to save his stepfather, "Crash" Simpson, from cancer. Crash later dies in a motorcycle accident and Mephisto attempts to take Blaze's soul, only to be thwarted by Crash's daughter Roxanne, who had learned of the deal and had prepared a counter-spell based on selfless love. Unable to take Blaze's soul, Mephisto has his revenge by binding Blaze with a demonic force.

Blaze then finds himself transforming into a demonic entity at nightfall, during which times he wields strange powers. He is called the Ghost Rider for his strange appearance. As time goes on, he is able to call on his demonic abilities whenever he wishes, not just at night. Eventually, he seems to have a different personality as Ghost Rider and it is finally revealed that Mephisto has forced Blaze to share his body with a demon rival named Zarathos.

Originally, Zarathos was stripped of his memories and so Blaze was in control whenever they transformed into Ghost Rider. But now, Zarathos' true personality has resurfaced and from then on it is a continuing battle for dominance between him and Blaze. Being a demon, Zarathos craves the punishment of sinners and so Blaze at times willingly releases him when criminals or other threats are nearby. However, it is always a struggle to force Zarathos back so that Blaze can resume his control and his human identity. At times, Zarathos tries to find ways to destroy Blaze's soul so that he may be free to enjoy complete physical existence.