Well, they could start off as rivals in the fanfiction. Maybe there's a misunderstanding about who should protect a certain area or group of people. But as they get to know each other better, they realize they have more in common than they thought and end up becoming friends and allies.
One possibility is that there could be a romantic angle in the fanfiction. Given their both being powerful and iconic superheroes, their relationship could develop into a romantic one. They might go on dates in between saving the world, like flying together to a secluded island for a picnic while still being on the lookout for any threats.
In a 'Wonder Woman meets Superman' fanfiction, they might team up to fight a powerful common enemy. For example, a super - villain from another dimension could threaten Earth, and their combined strength and different abilities would be needed to save the day.
In a 'Wonder Woman meets Avengers' fanfiction, there could be an epic battle against a common enemy. Maybe Thanos is trying to get his hands on some Amazonian artifact, and Wonder Woman teams up with the Avengers to stop him. They'd combine their powers in amazing ways. Iron Man could provide tech support while Wonder Woman uses her lasso of truth to expose any hidden plans of the villains. Hulk and Wonder Woman could have an interesting dynamic, with Hulk being all brute strength and Wonder Woman having her grace and combat skills.
Well, in this fanfiction, perhaps they team up. Naruto, being from a world full of shinobi and complex politics, could share his knowledge with Wonder Woman. And Wonder Woman, with her experience in fighting for justice in her own world, could teach Naruto about different ways of protecting people. They might end up fighting a common enemy that threatens both their worlds.
In a 'Wonder Woman meets Robin' fanfiction, they could team up to fight a common enemy. Maybe a powerful supervillain is causing chaos in Gotham City or Themyscira, and their combined skills are needed to stop it.
In fanfiction, when Superman and Wonder Woman meet, they might team up to fight a powerful new villain. Their combined strength and different abilities would make them a formidable duo.
In a 'Spider Man meets Wonder Woman' fanfiction, they could team up to fight a powerful common enemy. Maybe a supervillain from both of their universes combines powers and they have to use their unique skills. Spider Man's agility and web - slinging along with Wonder Woman's strength and her Lasso of Truth would make for an exciting battle.
In such a fanfiction, there could be an epic team - up. The Bat family, with their detective skills and combat expertise, could join forces with Wonder Woman. Maybe they'd work together to stop a powerful villain that neither could defeat alone. For example, Batman's strategic mind combined with Wonder Woman's superhuman strength would make for a formidable duo against a threat like Darkseid.
In a spiderman meets superman fanfiction, they might start as rivals. Maybe they misunderstand each other's intentions at first. For example, Superman could misinterpret Spider - Man's web - slinging in the city as some sort of unregulated vigilante behavior. But then, they would realize they have a common goal, like saving the world from a powerful villain. They could combine their powers, Superman's super strength and flight with Spider - Man's agility and web - shooting, to defeat the bad guy in an epic battle.
In this fanfiction, Goku and Superman might have an epic battle at first. They could test each other's strength and speed. Maybe Goku would start with his Super Saiyan form and Superman would counter with his heat vision and super strength.
In a 'superboy meets superman fanfiction', there could be an epic battle at first as they test each other's powers. Maybe Superboy is initially a bit rebellious and wants to prove himself against Superman. Then they could end up teaming up to fight a common enemy like Lex Luthor or some other powerful villain from the Superman universe.
A great scenario would be that they meet because of a common enemy. Let's say Lex Luthor has a new evil plan that involves both Gotham and Themyscira in some way. Batman is investigating on his end in Gotham, and Wonder Woman is alerted to the threat to her homeland. They cross paths during their investigations, and at first, they are cautious of each other. But as they share information, they start to respect each other's skills and abilities. This could lead to a great partnership in the fanfiction, with them combining Batman's intellect and gadgets with Wonder Woman's strength and magic.