A Thor and Superman crossover fanfiction could involve a plot where the two heroes are pitted against each other at first. Perhaps due to a misunderstanding caused by a villain's manipulation. Thor, with his hammer Mjolnir, and Superman, with his super strength and flight, would engage in an epic battle. But as they fight, they start to realize that they are both on the side of good. They then join forces to take on the real threat, which could be a powerful entity that wants to conquer both Earth and Asgard.
Well, in a Thor and Superman crossover fanfiction, neither would be clearly the stronger one. Superman's powers are based on his physiology as a Kryptonian. He can fly, has super strength, and various energy - based attacks. Thor, as a god, has his own set of powers. He can control the weather, has enhanced strength, and his hammer gives him special abilities. In a fight, if Superman uses his speed and long - range attacks effectively, he could gain an advantage. But Thor's magic and his combat experience could counter that. It really depends on how the writer wants to portray their abilities and how they interact in the story.
A crossover could start with Wonder Woman being summoned to Asgard by some mysterious magic. She finds herself in a strange new world and is initially met with suspicion. Thor, being the more open - minded of the Asgardians, decides to help her figure out how she got there. Along the way, they discover that an ancient enemy from Thor's past has plans to use Wonder Woman's power to open a portal to a realm full of chaos. They then have to work together to stop this from happening, with Wonder Woman teaching Thor some new combat techniques she learned on Themyscira and Thor showing her the power of the Asgardian magic.
Maybe there's a rift in the multiverse that pulls He - Man from Eternia and Superman from Earth into a strange new world. They find that their powers are weakened in this new place. So they have to work together, with He - Man teaching Superman about magic and Superman showing He - Man how to better use his strength in a non - magical way, to find a way back to their respective homes.
Superman could fit into the Marvel Universe in several ways in fanfiction. Firstly, his origin could be tweaked a bit. He could be an experiment gone wrong in a Stark Industries lab that gave him his powers. This would immediately connect him to the Marvel world. His powers would still be his trademark ones like flight, super strength, etc. He could then become a sort of protector of a particular city in the Marvel Universe, like New York. He would interact with the local heroes and villains. His presence would disrupt the power balance a bit, and some villains might target him specifically. But with his unwavering moral compass, he would stand up to them and become an important part of the Marvel Universe's tapestry of heroes.
In a more complex way, their powers could interact on a molecular level. For example, Superman's invulnerability might be enhanced by Invincible's unique cellular structure, or vice versa. They could also share their knowledge of different fighting techniques based on their powers. Since Superman has been a hero for a long time, he could teach Invincible some new ways to use his powers effectively in combat, while Invincible could show Superman some new, more brutal (but effective) ways of taking down opponents.
Well, in a Naruto and Thor crossover fanfic, maybe Naruto is on a journey and accidentally stumbles into a portal that leads him to Asgard. There, he meets Thor. Thor is intrigued by Naruto's tenacity and ninja skills. They could exchange their combat techniques. Naruto shows Thor how to move stealthily like a ninja, and Thor teaches Naruto some of his Asgardian battle tactics. And together they could face a threat to Asgard that is related to some dark chakra - like magic that has seeped into Asgard from another dimension.
Character consistency. Thor should still be recognizable as his Marvel self even in a different crossover world. For example, his strength, his sense of honor and his hammer - wielding abilities should be intact.
A lot of 'avengers thor crossover fanfiction' has the theme of redemption. Maybe Thor has to make up for some mistakes he made in the past, or he helps other Avengers members who are in need of redemption. It's a way to add more emotional depth to the characters. Also, the theme of exploration is common. This could be exploring new realms or new powers together as a team.
A common theme is the clash of different power systems. Thor's godly powers from Asgard are very different from the powers of DC heroes. Fanfics often explore how these powers interact, like Thor's lightning against Superman's heat vision.