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.
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.
I'm not entirely sure as it could be a very specific or fan - made story. But generally in the Ben 10 Ultimate Alien series, Ben Tennyson has a new Omnitrix which gives him access to ultimate forms of his aliens. The big story might involve him facing new villains, protecting the Earth and the galaxy, and dealing with the consequences of using his powers.
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.
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.
Well, it might be about how time heals the wounds or problems within the Ben 10 Alien Force universe. It could be that characters who had conflicts in the past are brought together by some time - related event. For example, perhaps an old villain returns but through the passage of time, Ben and his team have grown stronger and more united, and they use this new - found strength to face the threat. They might also discover something about the origin of their powers or the history of the aliens that is related to time.
There's a fanfic called 'Alien Exile'. In this story, Ben is not only stuck in alien form but also exiled from his home because people are afraid of his new appearance. It's a really emotional read as he tries to find a place where he belongs. Another one is 'Forever Alien'. This one takes a different approach by showing how Ben starts to embrace his alien form over time. He discovers new abilities and a new sense of self. And 'Alienated Ben' is a fanfic that focuses on the social isolation he experiences while stuck in alien form and how he overcomes it.
Ben Tennyson is definitely one of the main characters. He's the one with the Omnitrix and can transform into various aliens. Gwen, his cousin, who also has magical powers, might be another main character. And of course, there's Grandpa Max who has been guiding Ben in his adventures.