One great Ben x Kevin fanfiction could be about their adventures in a parallel dimension. In this story, they might face new aliens and challenges that test their friendship even more. Maybe they find a powerful alien artifact that only works when they combine their unique abilities, leading to a deeper understanding of each other.
The relationship between Ben and Kevin has room for growth. In fanfiction, they can develop feelings for each other that are more than just friendship. This adds a new layer of depth to their interactions. Writers can show how they deal with these new emotions while still being heroes and facing the threats in the Omniverse. There are also the power dynamics between them. Ben has the Omnitrix, but Kevin has his own unique powers, and how they combine or clash in different situations can make for exciting reading.
One possible fanfiction could be about Ben and Kai going on a new adventure in the Omniverse. Maybe they discover a new alien species that is causing chaos in a far - flung galaxy. Ben uses his Omnitrix to transform into different aliens to try and stop the threat, while Kai uses her martial arts skills to fight alongside him.
One possible plot could be that Rook and Ben go on an adventure to a new planet in the Ben 10 Omniverse. They encounter a strange alien species that has a unique power. Ben tries to use his Omnitrix to transform into an appropriate alien to deal with the situation, but there are some glitches. Rook, with his Plumber skills, helps Ben figure out what's wrong and together they overcome the challenges and make new friends among the aliens.
I haven't actually read this specific fanfic, but generally in a 'Ben x Esther' fanfic in the Ben 10 Omniverse setting, it might explore their relationship in different ways. It could involve adventures where they team up, and their characters' growth while dealing with various threats in the Omniverse. Maybe it also delves into how their different personalities interact and complement each other.
Well, in a fanfiction, they could be on a mission to save a planet that is on the verge of destruction. Ben uses his alien powers to hold off the immediate threats, like asteroids or attacking creatures, while Kai tries to find the root cause of the planet's problems, which could be some sort of evil technology or a corrupt leader.
Well, if Ben was kidnapped in fanfiction, his friends would probably start a huge rescue mission. Gwen would use her magic and Kevin his powers to track him down. They'd face all sorts of challenges along the way, like bad guys trying to stop them or traps set by the kidnappers.
In Ben 10 Omniverse fanfics, the relationship between Ben and Gwen can be really interesting. Usually, they have a very strong bond as cousins. In some fanfics, their relationship might be explored more deeply, like how they support each other during battles. Ben with his Omnitrix powers and Gwen with her magic often make a great team, and fanfics can show their interactions in new and exciting ways, such as when they face a new and extremely powerful enemy that they have to combine their skills to defeat.
There's also a chance that it could be a former enemy of Ben who has a grudge. They might want to get revenge on Ben by kidnapping him and putting him in a difficult situation. It could also be a mad scientist who wants to study Ben's alien forms and the Omnitrix, so they kidnap him to do all sorts of experiments on him.
One popular plot twist is when Ben and Gwen end up in a different dimension where their roles are reversed. So, Gwen has something like the Omnitrix and Ben has to rely on his wits and basic combat skills without alien forms. This forces them to adapt in new ways and understand each other's struggles better.