Since it's a novel about a miracle man, there might be a group of believers or followers who are inspired by him. They could be characters that look up to him and support him in his adventures. On the other hand, there could be skeptics who don't believe in his so - called miracles and constantly question his authenticity. These different types of characters could interact with the miracle man and form the web of relationships that drive the story forward.
There could be a mentor figure in the novel who helps the miracle man understand his powers or his purpose. And of course, there may be a love interest. This person could add an emotional dimension to the story and be part of the miracle man's motivation to do good or overcome challenges. There might also be antagonists, like villains who oppose the miracle man and try to stop him from achieving his goals.
I'm not sure as I haven't read it. But it could be the miracle man himself as the central character. There might also be characters like his friends, family or foes who play important roles in his story.