Identity is a big theme. In many fanfictions, like 'Kakarot in the Final Fantasy World', Kakarot has to figure out his place. Is he still just a Saiyan or does he become part of the new world? Also, friendship is a theme. For example, in 'Kakarot in the My Hero Academia World', he forms bonds with the students at U.A. High School, which is different from his relationships back in his own world.
Power exploration is a common theme. Writers often explore how Kakarot's Saiyan powers compare and interact with the powers in the crossover world, like in 'Kakarot in the One Piece World' where his strength is contrasted with Devil Fruits powers. Another is cultural clash. When Kakarot enters a different universe, there's always a clash between his Saiyan upbringing and the new world's culture.
Well, 'Kakarot and the Elder Scrolls' is quite popular. In this fanfiction, Kakarot is transported to the land of Tamriel. His combat skills and Saiyan nature make for some really cool encounters with the various races and creatures there. There's also 'Kakarot in the Pokemon World'. It's a fun read as he tries to understand the concept of Pokemon battles and his Saiyan strength gives a whole new dimension to the Pokemon world.
In such a fanfiction, it could lead to some interesting plot twists and character developments. Maybe Goku's identity as Kakarot would be explored in a deeper and more complex way.
One common theme is adventure. Since the Valerian universe is full of exciting and unknown elements, when crossed with other universes, it often leads to epic adventures. For example, a crossover with a space - opera like Star Trek could result in a story where Valerian and his companions explore new galaxies together with the Star Trek crew.
One common theme is the clash of different powers. For example, when the Incredibles cross with other superhero groups, there's always the exploration of how their powers compare and contrast.
Power struggle is a common theme. Starscream is often power - hungry in the original Transformers series, and in crossovers, this trait is magnified when he enters new universes with different power hierarchies. For example, in a crossover with the Lord of the Rings, he might try to claim the One Ring to gain ultimate power.
The theme of adaptation is quite prevalent. Asriel has to adapt to different cultures, technologies, and ways of life in the crossovers. For instance, if he enters a cyberpunk - themed world, he has to get used to the high - tech environment and the different social structures. Another common theme is the exploration of good and evil. When he crosses over to a world like the Lord of the Rings, he has to decide which side he's on and how to fight against the forces of evil in that world. This exploration of moral concepts is an important part of many Asriel crossover fanfictions.
A common theme is the clash of different assassin cultures. For example, when Hitman crosses with other assassin - themed franchises, their methods of killing, their code of ethics, and their loyalty to their respective organizations are often compared and contrasted.
One common theme is the exploration of power dynamics. When the X - Men cross over with other groups, like the Avengers or the Fantastic Four, there's always a comparison and contrast of their powers. For example, in a crossover with the Avengers, the mutants' powers might be seen as more unpredictable compared to the technology - based powers of some Avengers.
One common theme is power struggle. Since Shego has her own set of powers, when she crosses over into other universes, there's often a conflict or comparison of powers. For example, in a crossover with the Powerpuff Girls universe, her powers are pitted against the superpowers of the girls. Another theme is the exploration of her character. Writers often use crossovers to show different sides of Shego, like her potential for redemption or her adaptability in new situations.
One common theme is the clash of different investigative styles. For example, when a character from 'The Mentalist' crosses over with a detective from another show, their methods of solving crimes might be very different. Another theme is the exploration of new worlds. If it's a crossover with a science - fiction or fantasy show, the mentalist character has to adapt to a whole new set of rules and environments.