I don't know for sure as I haven't read it. But the orphan is likely to be one of the main characters. There might also be some people who help or oppose the orphan in his/her journey.
Since it's a novel about an orphan, it could be centered around the orphan's search for identity. The 'out of the dark' part might imply that the orphan is emerging from a state of despair, ignorance, or a bad living condition. It could involve the orphan finding new relationships, a new home, or a new purpose in life.
It could be a symbol of the unexpected. In the context of 'An Orphan X Novel', the 'Dark Horse' might represent a character or an event that comes as a surprise and changes the course of the story.
Yes, they could be related in various ways. For example, 'Dark Horse' might be a character or an important element in the 'An Orphan X Novel'. Or perhaps the themes of the 'Dark Horse' are somehow mirrored in the plot or character development within the 'An Orphan X Novel'. However, without more specific information about both, it's hard to be certain.
In the 'Dark Phoenix X - Men Graphic Novel', Jean Grey is the most prominent character as she is at the heart of the Dark Phoenix saga. Cyclops is her lover and is deeply affected by her transformation. He is constantly trying to figure out how to help her. Wolverine, with his tough and no - nonsense attitude, is another key figure. He has a certain connection to Jean that adds an interesting dynamic. Professor X, of course, is the wise leader guiding the X - Men in this crisis. Storm, with her weather - controlling powers, is also part of the main cast, helping the X - Men in their battles against the Dark Phoenix.
Jean Grey is the central character as she becomes the Dark Phoenix. Cyclops, her love interest, is also a main character. Wolverine, with his complex relationship with Jean, is important too. Professor X, who tries to guide the X - Men through this difficult situation, is another main character in the 'X Men Dark Phoenix Graphic Novel'.
Not having read 'the orphan boy story', it's hard to say for sure. However, the orphan boy himself is the central character. There could be other orphans in the story who become his friends or rivals. There may also be an adult figure, like a teacher or a priest, who plays an important role in the boy's life, either by guiding him or by providing some form of support or challenge.
The main character is surely the little orphan. There could be other characters like other orphans in the same place who are friends or rivals. And there might be adults in the story, like a strict orphanage director who creates some of the challenges for the main orphan character, and a friendly neighbor who offers some help or a different perspective to the orphan.
Obviously, Percy is one of the main characters since the title mentions him. There might also be a mentor figure, someone who takes Percy under their wing and helps him navigate his life as an orphan.
Sarah Manning is a main character. She's a con - artist who gets drawn into the clone mystery. Cosima Niehaus is another important one. She's a scientist among the clones. And Alison Hendrix, a suburban housewife clone.
I'm not sure as I haven't read the specific 'in the dark novel'. But usually in such novels, there could be a protagonist who is often at the center of the story, facing the challenges presented by the dark elements. There might also be an antagonist, someone or something that is causing the problems or the 'darkness' in the protagonist's life.