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.
One common theme is the clash of different cultures. For example, when the Lion King world crosses with another, like 'Aladdin', there's a difference in the way the characters from each world view things like power, friendship, and family. Another theme is the idea of unity. Characters from different universes often have to come together to face a common threat.
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.
A Lion King Transformers crossover fanfiction would likely involve a lot of character interactions. The Transformers, being from a completely different universe, would have different values and ways of life. But they could find common ground with the animals in The Lion King. For instance, the Autobots' fight for peace could align with the lions' desire to protect their home. The Decepticons, on the other hand, might see the Pride Lands as a place to conquer for resources. This would set up a great conflict, with the lions and Autobots teaming up to fight against the Decepticons.
Perhaps there's a magical event that brings Tarzan and the Lion King world together. A mysterious force could transport Tarzan to the Lion King's world. He would be a strange sight for the Pride Lands animals. Tarzan could bond with young Simba or Nala. They could go on adventures together, exploring new parts of the Pride Lands. Tarzan might also introduce some of his jungle friends like the elephants or monkeys to the Pride Lands, creating a unique cultural exchange between the two very different ecosystems.
Well, perhaps in this fanfiction, there could be a common enemy for both Balto and the Lion King characters. Let's say an evil group of hyenas from Balto's world team up with Scar's old followers. Balto and Simba would then have to work together, combining their leadership and survival skills. Balto's experience with the wilderness and Simba's knowledge of the Pride Lands would be a great combination to defeat this new threat.
One common theme is self - discovery. The human kid often enters the Lion King world not fully understanding themselves, but through their adventures, they learn about their own strengths and weaknesses. For example, facing a dangerous situation might make them realize they're braver than they thought.
The Pride Lands could be a new battleground for the Transformers. The lions' social structure could be mirrored in the Autobot - Decepticon conflict. For example, the king of the lions is like the leader of the Autobots.
One idea could be that the ponies from MLP find themselves in the Pride Lands. Maybe Twilight Sparkle uses her magic to help solve a problem that the lions are facing, like a drought. She could use her knowledge of spells to bring rain.
Start with a strong inciting incident. For example, a magical portal opens and transports a group of ponies to the Pride Lands. This immediately creates a situation full of potential conflict and discovery.