Check out dedicated Superman fan blogs or websites. These often have sections dedicated to fanfiction reviews and recommendations. They might have curated lists of the 'best superman crossover fanfiction' that have been carefully selected by the blog's authors or community members.
A really cool 'best superman crossover fanfiction' might involve Superman crossing over with the Justice League from another universe. This can lead to some amazing scenarios where he has to adapt to different versions of his teammates and face new threats. It's interesting to see how his powers and character are perceived in these alternate settings.
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.
One common theme is the contrast between their powers and personalities. Superman is all - powerful and has a more optimistic view, while Batman is a normal human with great skills and a darker, more brooding nature. Their interactions based on these differences are often explored.
Well, one possibility could be that they team up to fight a common enemy from another dimension. Maybe a powerful villain who can manipulate time and space, which would be a great threat to both Superman's Metropolis and Flash's Central City. This would force them to combine their unique powers. Superman's super strength and flight, along with Flash's super speed, could create some really cool battle scenes.
A superman crossover with Wonder Woman would also be great. Maybe in a story where they have to travel to another dimension to stop an ancient evil. Their different powers and personalities would create a lot of interesting interactions, like Superman's more down - to - earth (even though he's from another planet) approach compared to Wonder Woman's Amazonian heritage.
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.
One possible plot could be that Superman is somehow transported to the Marvel universe where the Avengers operate. He initially clashes with them due to misunderstandings. For example, his super strength might be seen as a threat. But then they realize they can team up to fight a common enemy, like a powerful alien or a super - villain who has the ability to manipulate time. They combine Superman's powers such as heat vision and flight with the Avengers' diverse skills like Iron Man's technology and Captain America's leadership to save both universes.