A third popular storyline could be a time - travel adventure. Ben and Helen accidentally get sent back in time and have to figure out how to get back to their own time while also making sure they don't accidentally change history. Along the way, they meet younger versions of their friends and family, and Ben has to be careful not to use his alien powers in ways that could disrupt the timeline.
One popular storyline could be Ben and Helen teaming up to fight a new, powerful alien threat that neither could handle alone. They combine their unique abilities, like Ben's alien transformations and Helen's skills, to save the day.
Some 'ben 10 omniharem fanfic' might explore how the omniharem affects Ben's growth as a hero. Maybe the relationships make him more empathetic or teach him new ways to use his alien forms in different social situations. In these fanfics, the interactions within the harem could lead to character development not just for Ben but also for the other members of the harem.
There might be a 'Ben 10 Helen fanfic' where Helen discovers a new alien form that Ben hasn't yet unlocked. This could lead to an exciting story as they explore the powers of this new form together and how it can be used for good. She could also have a personal journey within the story, growing in confidence and ability as she helps Ben fight villains.
One interesting storyline could be Ben and Gwen having to face a new, powerful alien threat that they've never encountered before. They might have to combine their unique skills and powers to defeat it.
One popular storyline could be Charmcaster and Ben 10 teaming up against a common enemy. Maybe an ancient evil that threatens the entire universe. Another might be a love - interest - based story where Charmcaster has a secret crush on Ben 10 and tries to win his heart in a world full of magical and alien challenges. Also, there could be a story about Charmcaster teaching Ben 10 some of her magic, which could lead to new and exciting adventures.
Another storyline could involve Ben facing off against a new villain who is specifically after the Biomnitrix. This villain might have his own set of powers that make him a formidable opponent. Ben would then have to figure out how to use the new aliens in the Biomnitrix to defeat this enemy. Maybe he has to team up with some of his old alien forms in creative ways.
One popular storyline is Ben finding out about Dean's hunting life in a dramatic way. Maybe he stumbles upon some of Dean's hunting gear and starts asking questions. Another could be Dean taking Ben under his wing and teaching him the ropes of hunting while also trying to protect him from the more dangerous aspects of the supernatural world. And then there's the idea of Ben having some latent supernatural abilities that Dean helps him discover and control.
Well, in some fanfictions, there might be a plot where Harry Hook and Ben are in a love triangle with a female character. Maybe they both have feelings for the same girl and have to compete in a non - violent way, like through acts of kindness or heroic deeds. Also, there could be a story where Harry Hook is actually a long - lost relative of Ben's and they have to deal with the implications of that discovery.
One idea could be exploring an alternate universe where Ben has different alien forms with unique abilities not seen in the original series. Another could be a story focused on Ben's relationships with his friends and family in a more in - depth way, like how they react to his alien - changing powers. A third idea might be a time - travel story where Ben goes back in time and has to use his powers to fix something in the past.
One interesting storyline could be about Ben using his alien forms in new and creative ways to fight against a powerful, previously unknown villain in the Justice Era. For example, he might combine the powers of different aliens in unexpected combinations to overcome challenges.
One possible storyline could be Ben and Julie going on an adventure together to a new planet. They encounter strange alien creatures and have to use Ben's alien forms and Julie's martial arts skills to survive. Another could be a story where they face a powerful villain who is threatening their hometown, and they must work together to stop the villain and protect their loved ones.