If this was a story that blended Stephen King's style with something related to Dennis Raider, the characters could be a mix of the archetypes we see in King's novels and something unique to Raider. For example, there could be a character like the strong - willed protagonist that King often creates, but with a twist related to Raider. There might also be secondary characters that are either helpers or hindrances, perhaps with motives and backstories that are intertwined with both King - like horror elements and Raider - specific details. But all of this is pure speculation until we know more about the actual story.
As I said before, I'm not sure about this story. But if it was related to Stephen King's typical works, we might expect to see characters with complex psychological profiles. If Dennis Raider was a main character, he could be someone with a troubled past or a hidden agenda. However, this is just guesswork without knowing the real story.
Since we don't really know what this 'Stephen King Dennis Raider Story' is, it's difficult to talk about the characters. But in King's stories, characters often face extraordinary situations that test their sanity and morality. Maybe Dennis Raider is a character who is thrust into a nightmarish world filled with the kind of horror elements that King is famous for. Maybe he has to battle against supernatural forces or his own inner demons. Without more details, we can only imagine what kind of characters might be in this story.