Castle Believes Kate is Dead Fanfic: How does Castle's character change in this type of fanfic?

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.

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.

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.

Obviously, Castle and Kate are the main characters. Castle is the one who has the belief that Kate is cheating.

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.

Yes, it might be a plot point in some fanfic. Fanfic often takes existing characters and creates various scenarios, so it's quite possible that in a particular Castle - related fanfic, Castle could witness Vaughn kissing Kate.

He'd probably be shocked. Just freeze in place for a moment, not believing what he's seeing.

In a fanfic where they have a baby, their relationship would shift. They would now be partners not only in crime - solving but also in parenting. Castle would likely become more domesticated, helping with diaper changes and midnight feedings. Beckett would have to learn to let Castle in more on the parenting front, and they would communicate more about family - related matters. This new aspect of their relationship would add a different layer of complexity and closeness to their bond.

He might react with jealousy. He could glare at Josh and then give Beckett a hurt look before storming off.

He might become more protective. He'll be constantly on guard to make sure nothing bad happens to Beckett.