Gwen would be a great character to pair with Alien X. Her magical abilities could complement Alien X's powers in interesting ways. For instance, when facing a threat that requires both brute omnipotent force and the finesse of magic. Another good pairing could be Kevin. His ability to absorb and use different forms of energy could interact with Alien X's power source in unexpected ways, like when they need to combine their powers to break through a powerful energy barrier.
One idea could be exploring the backstories of the aliens more in - depth. For example, how did Four Arms become so strong? Another could be a story where Ben has to team up with his enemies to fight a greater threat. Maybe Vilgax and Ben have to work together against an even more powerful alien race.
Power and responsibility is also a big theme. Ben has to handle the powers of his alien forms responsibly, especially when dealing with aliens. In many fanfics, there's also the theme of discovery. Ben discovers new things about the aliens, their cultures, and their abilities. For example, he might learn a new power from an alien that he can use in a different way. There's also the theme of cooperation, where Ben and the aliens work together to achieve a common goal, like saving a planet or stopping a powerful enemy.
Well, aside from the main trio, characters like Vilgax are often included. He's a powerful villain and can create a lot of conflict in the story. Grandpa Max is also a good character to add. His wisdom and experience can guide Ben in difficult situations. And then there are the aliens themselves. For example, Rath is a very popular alien form of Ben, and fans like to write stories that focus on his wild and unpredictable nature.
There's a fanfic called 'The Bond Beyond Time'. In this one, Ben and Gwen are thrown into a time - loop situation that forces them to confront their feelings for each other in new ways. It has some really exciting action scenes combined with the emotional exploration of their relationship.
One idea could be exploring Alien X's internal conflict between Bellicus and Serena in a new situation. For example, when faced with a moral dilemma on a planet where two species are at war and both have valid reasons for their actions. Another plot could be Alien X having to deal with a powerful new enemy that can somehow disrupt his omnipotent powers. Maybe this enemy has the ability to split Bellicus and Serena's consciousness further, causing chaos within Alien X.
In the 'Ben 10' series, Ben Tennyson is the main character. He has a device called the Omnitrix which allows him to transform into various alien forms. Gwen Tennyson is Ben's cousin. She also has magical abilities and often teams up with Ben in their adventures.
The 'Ben Ten x Gwen' fanfictions are appealing because they allow for a different take on the characters. The original series might not focus on a romantic relationship between them, but fanfictions can. They can create new storylines, new settings, and new challenges for the two characters. This gives readers a fresh perspective on Ben and Gwen and their relationship.
Fourarms is really cool. He's big and strong with four arms, which gives him great power in combat. Heatblast is also amazing as he can generate and control fire.
Well, there's 'The Alien Bond'. In this fanfic, Ben Tennyson forms a very special bond with an alien that has the power to manipulate time. It's really interesting as it shows how their relationship develops and how they use their combined powers to face various challenges. There are also some fanfics that explore what would happen if Ben could communicate with his alien forms on a more personal level, like in 'Ben and the Sentient Aliens' where the aliens have their own personalities and thoughts that Ben has to deal with.