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 common theme is friendship. The female alien often forms a strong bond with Ben, and they support each other through different situations. Another theme is power. The female alien usually has some unique power that plays an important role in the story.
I'm not entirely sure about the exact plot details of 'ben 10 ultimate alien the big story'. It might involve Ben Tennyson using his various alien forms to face some big threats and challenges, but that's just a general guess.
In this fanfic, the relationships among the Omnitrix aliens - as - humans would be full of surprises. The competitive relationships between some aliens might turn into friendly rivalries. Take Diamondhead and Four Arms, for instance. As humans, they might compete in sports rather than in battles. Their relationships with humans who don't know their true identities would also be interesting. They would have to constantly lie to maintain their cover, which could lead to feelings of guilt and isolation. But at the same time, they could form deep and meaningful relationships with those who accept them for who they are, despite their secrets. This would create a web of relationships that are both complicated and fascinating to explore.
Ben himself is obviously very popular. He's the main character and all the stories revolve around him. People like to write about his adventures and how he uses his alien forms to save the day.
One interesting storyline could be Ben getting stuck in an alien form permanently and having to learn to live a normal life like that. He would face challenges like going to school or dealing with his family while being an alien.
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.
In a Ben 10 fanfiction story, the relationship between the alien and the boy can be one of mutual discovery. The boy, usually full of curiosity, is drawn to the alien's otherworldly nature. For example, the alien might have powers or abilities that the boy has never seen before. The alien, on the other hand, may be intrigued by the boy's human nature. They rely on each other. The boy can offer knowledge about Earth, like where to find food or shelter. The alien can use its powers to protect the boy from danger. It's a relationship based on adventure and learning from each other.
Once upon a time, there was an alien named Zoltan in the Ben 10 universe. He met a boy named Ben. Zoltan was from a far - off planet with amazing powers. Ben was intrigued by Zoltan's abilities. They became friends and went on adventures together. Zoltan taught Ben some of his alien skills, like how to levitate small objects. Ben, in turn, showed Zoltan the cool places on Earth. One day, they had to face an evil alien who was trying to steal a powerful crystal. With their combined skills, they defeated the bad alien and saved the day.
In this story, the central character is Ben Tennyson. His ability to transform into ultimate aliens using the Omnitrix makes him the key figure. Gwen, his cousin, is an important part of the story too. Her magical abilities often come in handy during their adventures. Grandpa Max, with his wisdom and combat skills, is another mainstay. Additionally, there could be antagonists or supporting characters that interact with Ben, Gwen, and Grandpa Max. These could be other aliens, whether they are friends or foes, that add to the complexity of the story. For example, some of Ben's alien forms like Heatblast or Four Arms might have a more prominent role in certain parts of the story, depending on the situation and the challenges they face.