Obviously, Castle and Kate are the main characters. Castle is the one who has the belief that Kate is cheating.
I'm not sure specifically as there could be many different interpretations. It might be a fan - created story where a character named Castle believes that Kate is cheating in the context of their relationship within the fan - created scenario.
The main characters are likely Castle and Kate. Castle is the one who believes Kate is alive, so he's a central figure in this fanfic. Kate, whether she's present or just the subject of Castle's belief, is also a main character as the story revolves around her being alive.
I'm not sure specifically as there could be many different fanfics with that title. It might be about a character named Castle who has a strong belief that Kate is alive. Maybe Kate was in some sort of dangerous situation or presumed dead, and Castle is determined to prove she's alive.
One common theme could be Castle's journey of grief. He might struggle to come to terms with her death, which could involve him isolating himself from friends and family. Another theme could be his determination to find out the truth behind her death, suspecting foul play even if others think it was an accident.
He becomes more withdrawn. Normally Castle is quite social and outgoing, but with Kate gone, he loses his spark. He may stop joking around as much and become more serious.
Kate and Castle are the main protagonists. Kate, as she endures the experience of giving birth to what is described as a 'big baby'. Castle, on the other hand, is there with her, being an important part of the story as he shares in this significant moment. There could potentially be other minor characters like family members who might come to visit later, but the focus is on Kate and Castle.
Well, it could be a young adventurer who stumbles upon the ruins of the castle and becomes the key to its resurrection. Maybe they have a special gift or power that is needed.
A group of knights could be the main characters. They are sworn to protect the castle and when it begins to disappear, they see it as their duty to figure out what's wrong and stop it. They could bring different skills like swordsmanship, tracking, and knowledge of ancient magic to the story.
A brave knight who was injured in battle could be a main character. He might be struggling with not only his physical wounds but also his mental state as he's used to being strong and active.
I don't know for sure as I haven't read it. But it could be the typical hero - like a brave knight or a curious adventurer. There might also be a villain, perhaps a dark sorcerer or a power - hungry noble who wants to control the castle.