Kevin Levin can be a popular character too. His unique abilities, like absorbing and using the properties of different materials, can create interesting interactions in the dimension - traveling scenarios. He could be a rival or an ally to Ben in different fanfiction plots.
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.
Naruto himself is obviously very popular. Since it's his name in the fanfiction title, he's often the main character traveling through dimensions. Sasuke is also common, as his complex relationship with Naruto can be explored in different dimensions. Kakashi is another popular choice, his skills and wisdom can play interesting roles in different dimension settings.
Well, Batman is an obvious choice. He has the resources, the intelligence, and the motivation to venture into other dimensions. If there's a threat in another dimension that could potentially affect Gotham, he'd be there. Harley Quinn could also be a character who gets involved in dimension travel. Maybe she's chasing after the Joker who has somehow ended up in another dimension. And Oracle, with her technological expertise, could accidentally stumble upon dimension - traveling technology and end up in a different dimension while trying to fix or improve it.
In some fanfictions, Ben might travel to a dimension where his family members have different personalities or abilities. This could lead to a lot of self - discovery for Ben as he has to deal with these new versions of his loved ones. He may also have to find a way to get back to his own dimension while facing challenges specific to that new dimension.
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 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.
Luna Lovegood is quite popular in 'Dimension Hopping' fanfiction. Her unique perspective and open - mindedness make her well - suited for exploring strange dimensions. Draco Malfoy can also be a key character, especially in stories where he has to team up with the protagonists in a different dimension due to some unexpected circumstances.
One popular concept is the idea of a 'Mirror Dimension' in Harry Potter fanfiction. It's like a parallel world that reflects the main HP universe but with some key differences. Another is the 'Time - Locked Dimension' where time moves at a different pace. This can create interesting scenarios where characters from the normal HP world enter and have to adapt quickly.
One popular trope is the 'fish - out - of - water' scenario. Red Hood finds himself in a dimension with completely different cultures and norms, and he has to figure out how to navigate it. Another is the 'parallel self' trope, where he meets an alternate version of himself in another dimension. This can lead to some interesting self - discovery moments for the character.
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.