Kevin Levin can be a really cool addition. His ability to absorb materials and transform into different forms makes for some exciting action scenes. Also, his complex backstory can create interesting storylines when combined with the reader's character, like if the reader helps him come to terms with his past or something similar.
Definitely Ben Tennyson himself. He's the main character and the one with the Omnitrix. His different alien forms like Heatblast, Four Arms, and XLR8 can add a lot of action and variety to the story.
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.
Sometimes Link from The Legend of Zelda can be an important character, since Ben Drowned is related to the Zelda games. Link might be a part of the backstory, like his actions in the game world might have somehow contributed to Ben's current state. So in the fanfiction, he could be a figure that haunts the memories or the digital space that Ben and the reader interact in.
Ben Tennyson is obviously a must - as he is the main character. Gwen is also very popular as she has her own powers and often helps Ben. Kevin Levin is another great choice. His ability to absorb materials and his complex relationship with Ben add a lot of depth to the story. Vilgax is a classic villain that makes any fanfiction more exciting. He's powerful and has a long - standing rivalry with Ben.
In Ben 10 crossover fanfiction, many writers like to include Azmuth. As the creator of the Omnitrix, he has a wealth of knowledge and power. His presence can add a layer of depth to the story, especially when it comes to explaining the science behind the Omnitrix or helping Ben understand new alien forms. Also, Charmcaster is often included. Her magic abilities can create some interesting dynamics when combined with Ben's alien powers in a crossover.
The main characters are Ben and Kai. Ben is a heroic figure with the Omnitrix, which is a device full of alien DNA that he can use to transform. He is brave and always ready to protect the Omniverse. Kai, on the other hand, is a feisty and determined character. She brings her own charm and abilities to the story. In a 'Ben 10 Omniverse Ben x Kai' fanfic, these two are the focus. Their different personalities clash and complement each other as they navigate the dangerous and exciting world of the Omniverse together.
Mike and Sulley are definitely the most popular. They are the main characters in the movie and have such distinct personalities. Mike's determination and Sulley's big - hearted nature make them great characters to interact with in fanfiction. Another popular one would be Randall. His devious nature can add a lot of drama and conflict to the story when paired with the reader. And of course, Dean Hardscrabble is also a great addition as she can be a strict authority figure that the reader has to either impress or outwit.
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.
Ben is an obvious choice as he is the main character. His different alien forms offer a lot of possibilities for storylines. Gwen is also great as she has her own powers and a complex relationship with Ben. And of course, Kevin, with his unique abilities and his friendship - turned - rivalry - turned - friendship again with Ben.
One popular character could be Gwen from the Ben 10 series, especially when she is incorporated into Omniverse fanfiction. She has her own set of powers and a strong personality. In fanfiction, she can be a great support or even a rival to the female Ben.