Captain America would be a great addition. His leadership and moral compass could guide Ben in some tough situations. And then there's Wolverine. His healing factor and fierce fighting style would contrast well with Ben's more alien - based combat. They could have some epic battles side by side.
There might be a 'Ben Ten Marvel Fanfic' where Ben meets the X - Men. Imagine Ben showing off his alien forms to the mutants. He could learn from Professor Xavier about controlling his powers better, while also teaching the X - Men some new combat techniques using his alien abilities. For example, Heatblast could help Iceman with his control over heat and cold in a new way.
Team - up and friendship is also a major theme. Ben, coming from his own universe, has to form alliances with Marvel characters. These relationships develop as they face various threats together. For example, Ben might become friends with Iron Man and learn about technology and responsibility from him.
The story could start with Ben arriving in the Marvel universe just as the zombie outbreak begins. He'd be confused at first but quickly realize the danger. He might start by using some of his basic alien forms to test the zombies' weaknesses. As the story progresses, he could meet some of the Marvel heroes who are still alive and form an alliance to find a cure.
Well, in a Ben 10 and Marvel Zombies fanfic, a great crossover would involve Ben's Omnitrix getting corrupted by the zombie virus. This could lead to some of his alien forms having zombie - like traits. Also, imagine Ben teaming up with the few remaining non - zombified Marvel heroes like Spider - Man. They could use Ben's shape - shifting abilities and Spider - Man's agility to outwit the zombies.
Loki could also be a main antagonist. He could see Ben as an interesting new player in the universe and try to manipulate him for his own gain. Or he might want to use the Omnitrix to cause chaos across the multiverse.
Another interesting plot could be that some of Ben's alien forms are mistaken for new mutants in the Marvel Universe. He then has to prove that he's not a threat while also helping the X - Men deal with a common enemy that is interested in the genetic makeup of both mutants and Ben's alien forms.
One idea could be that Ben Tennyson's Omnitrix gets mixed up with some of the Infinity Stones' energy. This causes his aliens to gain new powers related to the Stones. For example, Four Arms could have super strength on a whole new level like Hulk. Another plot could be that the heroes from both universes have to team up to fight a villain who is using technology from the Ben 10 world and magic from the Marvel universe. Maybe a new character who has stolen some of Doctor Doom's knowledge and some of Vilgax's power.
A really interesting 'ben 10 marvel crossover fanfic' could be the one where Ben gets transported to the Marvel Universe during the events of Civil War. He has to decide which side to take, if any. His neutral stance is challenged as he realizes the implications of the Superhuman Registration Act on his own powers and identity.
I recommend Naruto to you. The protagonist of this novel could not only travel between the two worlds of Fire Shadow and Marvel, but he could also study giants, magically change species, bring partial dragon balls, and so on. He possessed the power of all things in the world, and he also had a sense of existence. Ban Ran? Not a problem! How could Ban Ran be a match for the combined strength of a Divine Master God and Naruto? With such a powerful protagonist and a wonderful plot, I'm sure you'll have a shocking reading experience. I hope you like my recommendation.😗