One idea could be a crossover where Naruto characters end up in the Trollhunters' world. Maybe Naruto and his friends could learn about the trolls' unique magic and fighting styles. For example, Naruto might be intrigued by the way trolls use their strength and size in combat and try to incorporate some of those elements into his own jutsu.
First, do some research on both Naruto and Trollhunters. Know their characters, their worlds, and their rules. For example, understand how chakra works in Naruto and how troll magic functions in Trollhunters. Then, come up with an interesting concept for the crossover. It could be something as simple as a character exchange between the two worlds or a more complex plot involving a shared enemy.
In a Jim x Morgana fanfiction, it could start with Morgana being trapped in a magical prison created by the Trollhunters long ago. Jim, out of his sense of justice and curiosity, decides to visit her. As he gets closer, he realizes that Morgana has a complex past and motives that are not entirely evil. Their interactions could then develop into a strange friendship that the other Trollhunters might not understand.
One idea could be that the characters from 3 Below end up in Arcadia Oaks where the Trollhunters are. They could team up to fight a common enemy that threatens both their worlds. Maybe the Gumm - Gumm trolls somehow form an alliance with the bad guys from 3 Below's planet, and the combined forces of the heroes have to stop them.
One great Steve x Eli fanfiction is 'The Unlikely Bond'. It beautifully explores their friendship evolving into something more. The author does a wonderful job of staying true to the characters' personalities from the show. Another one is 'Shared Secrets' which delves deep into their shared experiences and how it brings them closer. It has some really heart - warming scenes.
I'm not entirely sure if there is a specific 'Trollhunters' fanfiction where Barbra is pregnant. It's possible that some fans have written such a story, but it might not be very common. You could check fan - created forums or groups dedicated to 'Trollhunters' as well. Sometimes fans will share their own works or know of others that might fit this description. Another option is to reach out to other 'Trollhunters' fans directly and ask if they've come across any such fanfiction.
One interesting 'trollhunters fanfiction' story could be about an alternate universe where the trollhunters are from different time periods and have to team up. Another might focus on a character who was never fully developed in the original and gives them a more in - depth backstory. There are also those that explore romantic relationships between the characters in a new and unique way.
One possible fanfiction could be where Jim gets seriously hurt during a battle with a powerful troll. His friends then have to find a way to heal him, perhaps by seeking out a rare magical herb that is said to have great restorative powers. This could lead to a journey filled with various challenges and character development for his friends as they race against time to save Jim.
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.