Another popular character could be Kai Green. Fanfictions might explore her relationship with Ben more deeply or put her in solo adventures where she shows off her tough - as - nails attitude and her skills in handling difficult situations.
Obviously, Ben Tennyson is the most popular. He is the main character in the original series and in the fanfiction, his various alien forms are always a major draw. People love to see how he uses his powers in different gaming scenarios.
Another character that could be important is one of Ben's enemies who has a different reaction to his new female form. This enemy could either be more or less of a threat depending on how they view Ben now, and their interactions could drive the plot forward in interesting ways.
Gwen Tennyson also often plays an important role. In the dimension travel fanfiction, she might accompany Ben on some of his travels or be a key figure in the dimension he travels to. Her magic powers can add an interesting dynamic to the story, especially when combined with Ben's alien forms.
Well, obviously Ben Tennyson is a very popular character. He is the main character who wields the Omnitrix after all. His different alien forms like Four Arms or Heatblast are also quite prominent in the fanfiction world.
Some of the alien characters themselves, like Heatblast or Four Arms, are also popular. Their unique physical characteristics and powers make them interesting to write about. For instance, Heatblast's ability to control fire can lead to all kinds of scenarios, from battling fire - based villains to using his heat to solve environmental problems in a story.
Naruto and Ben are usually the most popular characters in Naruto Ben 10 fanfiction as they are the main protagonists of their respective series. Their unique abilities and personalities make them central to most fan - created stories.
Naruto and Ben are usually very popular characters in such fanfiction. Naruto's energetic and determined personality combined with his powerful ninja abilities make him a central figure. Ben, with his ability to transform into various aliens, also brings a lot of interesting plot possibilities. Another popular character could be Sasuke. His brooding nature and powerful sharingan abilities can create interesting interactions with Ben's alien forms and Naruto's skills.
In some fanfictions, there might be female versions of some of the alien species that are popular in the Ben 10 universe. These female alien characters with their own Omnitrix - like devices could be popular. For example, a female Heatblast or a female Four Arms. Their unique abilities and personalities would attract readers, and the stories could explore how they use their powers in different situations compared to their male counterparts.
Obviously, Ash from Pokemon is very popular. He has a long - standing history in the Pokemon franchise, so in the fanfiction crossovers, he brings his charm, his Pokemon training skills, and his dream of becoming a Pokemon master. Ben from Ben 10 is also quite popular. His ability to transform into different aliens makes for some really exciting interactions with the Pokemon world.
Ben Tennyson is obviously one of the most popular. Since he's the main character of the Ben 10 series, he's at the center of most fanfictions involving the Omnitrix and the Nemetrix. Fans love to write about his adventures and how he overcomes challenges.