Well, one common type of story might be about new alien forms that Ben discovers in the Omniverse. In lemon fanfiction, there could be a focus on the unique powers of these aliens in unexpected situations. For example, an alien with the ability to manipulate time might accidentally send Ben to a different era within the Omniverse, and he has to figure out how to get back while dealing with the local threats.
Some stories could revolve around Ben's relationships with his friends in a more in - depth way. Maybe there's a lemon - flavored fanfic where Ben and Gwen have a big argument, and it leads to them exploring different parts of the Omniverse separately. Ben then realizes how much he depends on Gwen and has to go on a journey to find her and make amends.
There might also be fanfictions that focus on the villains in the Ben 10 Omniverse. In a lemon - style story, a villain could somehow get a hold of the Omnitrix and use it in a really strange and dangerous way. Ben has to team up with unlikely allies to get the Omnitrix back and save the Omniverse from chaos.
Well, you could write a 'ben 10 omniverse fanfiction' where Ben loses his Omnitrix and has to rely on his wits and the help of his friends to still fight the bad guys. Or perhaps a story where the Omnitrix starts evolving on its own and gives Ben new and unexpected powers. Also, a plot where an old enemy from the past returns with a new and more dangerous plan.
Another plot might involve Ben and Kai getting accidentally transported to a parallel dimension where things are very different. They have to find a way back home while also dealing with the strange new versions of their friends and foes. Along the way, they discover new things about each other and their feelings start to change in this unfamiliar setting.
One interesting crossover could be Naruto characters getting access to the Omnitrix. Imagine Naruto being able to transform into different alien forms from Ben 10's Omniverse. It would completely change the way battles are fought in the Naruto universe.
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 concept could be creating new alien forms for Ben's Omnitrix that are unique to the fanfiction. Another might be exploring different relationships between Ben and his OC (Original Character) friends or foes. For example, an OC could be from a planet that has a very different culture from what Ben has encountered before, leading to interesting interactions and storylines.
Perhaps a story where an old enemy of Ben's targets Rook to get to Ben. Ben feels guilty and protective. They go on the run, hiding in different places across the galaxy. Along the way, they meet some interesting characters who help them. In the end, they face the enemy together, with Ben using his Omnitrix and Rook using his upgraded Proto - Tool to defeat the bad guy.
There could be some great fanfics out there that explore the relationship between Attwa and Ben Lemon in the Ben 10 Omniverse. However, finding them might take a bit of effort. You could start by searching for keywords related to the characters and the show in the search bar of fanfic websites. For example, try 'Attwa Ben 10 Omniverse' and 'Ben Lemon Ben 10 Omniverse'. Then, look through the results and read the summaries to see if they seem interesting. Some fanfics might focus on their adventures together, while others could delve into their character development or how they interact with other characters in the Omniverse.
Adventure is likely to be a theme as well. The Ben 10 Omniverse is full of exciting places and situations. Fanfics may center around Attwa and Ben Lemon going on adventures, using their unique abilities or powers to overcome obstacles.
One idea could be the reader having a unique alien ability that Ben discovers during an adventure. They then team up to fight a new villain that is immune to Ben's usual alien forms.
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.