Another storyline could involve a love interest between Ben (in one of his alien forms) and a female alien. For example, if Ben turns into Heatblast and meets a female alien who has a natural affinity for fire - like she can control different types of flames. They start off as rivals, competing to see who can control fire better, but then gradually develop feelings for each other as they face challenges together and learn more about each other's cultures.
One interesting storyline could be Ben getting stuck in an alien form permanently and having to learn to live a normal life like that. He would face challenges like going to school or dealing with his family while being an alien.
One interesting storyline could be a female version of Ben having to deal with different alien cultures in the Omniverse in a more diplomatic way than Ben usually does. For example, she might use her charm and intelligence to resolve conflicts between warring alien species on a planet instead of just using brute force with the Omnitrix transformations.
One interesting storyline could be Ben using his alien forms in a virtual gaming world to defeat a powerful digital virus. The unique combination of his real - world powers and the challenges of the game environment makes it exciting.
One interesting storyline could be about Ben exploring new alien forms that were previously unknown in the official series. Maybe he discovers a form that has unique powers that he has to learn to control quickly to face a new and powerful enemy.
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.
The combination of different alien species and their unique abilities. In fanfiction, female aliens can bring in new powers and characteristics that we haven't seen much in the original series. For example, a female alien with telepathic powers that can communicate with Ben's aliens directly in their minds. It adds a new layer of complexity and interaction.
Perhaps a story where there is a rivalry between two dance groups at the academy. They compete for the lead in a big performance. Along the way, they learn from each other's strengths and weaknesses, and in the end, they combine their talents to create an amazing show.
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.
Perhaps a story where Ben, despite being a ghost, finds a way to physically interact with the world for a short time with Klaus's help. They could then use this opportunity to right some wrongs or have experiences they missed out on when Ben was alive. This could involve things like going to a concert or helping a person in need.
One interesting storyline could be the epic battles between the two species in a desolate alien planet. The graphic novels often show the unique abilities of both aliens and predators in combat.