One common theme is Vash's struggle with his past. His actions in the past and the consequences they've had on him are often explored. Another theme is his relationships, like his friendship with other characters or potential romantic relationships. His pacifist beliefs are also a big theme, and how he tries to uphold them in different situations.
One great Vash the Stampede crossover fanfiction is the one where he crosses over with the Cowboy Bebop universe. It's really interesting to see how Vash's pacifist nature clashes and also meshes with the more morally ambiguous characters in Cowboy Bebop. The author does a great job of maintaining Vash's character while exploring new storylines in the Bebop world.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions related to various works, including Vash the Stampede. Just search for 'Vash the Stampede' in the search bar, and you'll get a bunch of results.
One popular trope is the 'fish out of water' trope. When Vash crosses over into another universe, he often has to adapt to new rules and cultures, which makes for some really fun and comical situations. For example, if he crosses into a modern - day Earth setting, his old - fashioned ways and his gun - slinging skills seem out of place but also really cool.
The relationship can be developed through shared experiences. For example, if they are in a life - or - death situation together, like being trapped in a collapsing building. Vash's protective nature towards Rem can shine through, and Rem can show her trust in Vash. Another way is through communication. They could have deep conversations about their pasts, their fears, and their hopes for the future.
A prevalent theme is the exploration of their different worlds colliding. Vash has his own world of being a gunman with a mysterious past, and Meryl comes from a more normal background. Fanfictions often explore how they bridge that gap. For instance, how Meryl gets used to Vash's erratic lifestyle, and how Vash adapts to having someone like Meryl care about him in a different way than others.
One common theme is the exploration of their complex relationship. Given their different personalities and backgrounds in the original work, fanfictions often delve deeper into how they understand and support each other. Another theme is adventure. They might go on new quests or face new threats together, building on the action - packed nature of the original story.
Love and friendship are common themes. The relationship between Vash and Rem is often explored in terms of deep emotional bonds. It could be a romantic love that develops over time or a strong platonic friendship that endures difficulties.
Overall, Trigun Stampede adheres closely to the manga. Some minor details might differ for the sake of the adaptation's flow and visual presentation, but the core remains the same.