They would become more protective of each other. Jim would be extra vigilant in keeping Claire safe from any threats, troll or human. Claire, on the other hand, would be more concerned about Jim not overexerting himself in his Trollhunter duties.
Another plot could revolve around their families' reactions. Jim's mom might be overjoyed but also worried, while Claire's family could have some mixed feelings. There could be cultural differences in how they approach the pregnancy, especially considering the troll - human aspect. And they have to navigate through all these family dynamics while also preparing for the new life coming into their world.
In addition to them, there are some other significant characters. For instance, Strickler, who has his own motives and secrets. He is a complex character who sometimes helps and sometimes causes trouble for the Trollhunters. And there are various troll characters with different personalities and abilities, each playing a role in the story's development, like Draal, a powerful troll who also has an important relationship with Jim.
Well, the 'trollhunters graphic novel' mainly focuses on the story of the chosen ones who become trollhunters. These characters have to face different challenges in the hidden world of trolls. There are epic battles, complex relationships between humans and trolls, and a lot of mystery. The graphic novel might also explore the different kinds of trolls, their cultures, and how the trollhunters adapt to deal with them. It's really an exciting read for those who like adventure and fantasy stories.
Maybe Jim is the protagonist who goes through various adventures and experiences. Or, he could be a key figure influencing the events in the story. Without more details, it's hard to say exactly.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, including those for Trollhunters. The tagging system there makes it easy to find exactly what you're interested in.
Some popular ones include those that are recreations of key scenes from the show with added twists from the fanfiction. For example, there are videos that might show an alternate ending to a particular Trollhunters arc. You can search for 'top Trollhunters fanfiction on YouTube' and look at the videos with the most views and positive ratings.