One big challenge for Benhypno in human form would be dealing with his memories and instincts from his alien self. He might have flashbacks or urges to act in an alien way when he's in a tense situation. For example, if he's in a fight, his first instinct might be to use his full alien powers, which he can't do without revealing himself. Also, he may face the challenge of making friends. Since he has a different background, he may find it hard to relate to normal human teenagers and their interests.
The plot could involve Benhypno trying to adapt to human society. Maybe he has to go to school and deal with normal teenage problems while hiding his true identity. He could struggle with making friends at first because of his unique background, but then gradually learn to fit in and use his powers in secret to help those in need.
One possibility could be that Benhypno in human form tries to blend into normal human society. He might struggle with understanding basic human emotions at first. For example, he could be confused by the concept of friendship and loyalty among humans. He might also have to deal with the fact that he has powers that he has to keep hidden from others, which could lead to some comical situations where he almost reveals himself accidentally.
He could develop more empathy towards humans. Since he's in human form, he gets to experience life from their perspective. This could make him more understanding and less likely to use his powers recklessly.
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 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.
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.
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.
The main characters are obviously Ben and Kai. Ben is the wielder of the Omnitrix, which gives him the power to transform into various alien forms. Kai is a strong - willed and adventurous character who often gets involved in Ben's escapades.
They might face the challenge of acceptance from their communities. Since they come from different sides, the Resistance and the First Order, there could be a lot of resistance to their union and the upcoming baby. Also, they could struggle with financial and living situation problems if they want to raise the child in a safe environment.