Well, identity is a big theme. Caleb is constantly trying to define himself in fanfics. Another theme is the struggle between right and wrong. He has made some morally ambiguous decisions, so fanfics often explore how he grapples with that. Also, the theme of love and friendship. His relationships with others, whether it's a romantic interest or just a deep friendship, are often central to the plot of the fanfics.
Well, you could try reading the first few paragraphs carefully. They often set the stage and give some clues. Or, ask someone who's familiar with the type of story for some tips on what to look out for.
You can start by choosing simple and popular stories. They often have clear plots and easy-to-understand characters. Just dive in and let the story unfold for you.
No, usually not. In a well - structured story, the interactions are planned to happen at specific points during the story progression. Vivec, being part of that story world, would not be available for communication before the tale begins.