Lex Luthor would see Gotham as a new playground. He could try to manipulate some of the power players in Gotham, like the mob bosses or corrupt politicians. Batman would be on to him quickly, though. And this would lead to a cat - and - mouse game between Lex and Batman. Meanwhile, Clark would be caught in the middle, trying to figure out who to trust and how to stop Lex without causing too much collateral damage.
It could be amazing. Imagine Clark Kent from Smallville finding himself in the dark and gritty Gotham. He might use his powers to help Batman clean up the city in a different way. Their different moral compasses could lead to some interesting interactions, like Clark's more idealistic view clashing with Batman's darker pragmatism.
The X - Men's teleportation abilities, like Nightcrawler's, could play a big role in a crossover. He could teleport around Smallville, which would be a new and strange experience for the Smallville residents. And in return, the advanced technology in Smallville could potentially be used to enhance the X - Men's teleportation technology, allowing for longer - range jumps or more precise landings.
The characters could interact in some really interesting ways. For instance, the Godfather characters, who are used to a certain level of political and criminal intrigue, might try to manipulate the magical beings from the HP world. The magical beings could be both a threat and an opportunity for them. Batman would be in the middle, trying to keep the peace and protect Gotham. He might find himself having to learn about magic quickly to deal with the new threats. The HP characters could also be intrigued by Batman's dedication and might even offer to help him in his fight against crime if they see that his cause is just.
The crossover can also change the characters' relationships. If Lois Lane from 'Smallville' meets Felicity Smoak from 'Arrow', they could become friends or rivals. This would affect how the male characters, Clark and Oliver, view each other. For instance, if Lois and Felicity become rivals, it might create some tension between Clark and Oliver as they try to support their respective friends. And in terms of character growth, both Clark and Oliver would have to adapt to new social dynamics, which could lead to them becoming more well - rounded characters.
When the Avengers arrive in Gotham in fanfiction, their interaction with Gotham's heroes would be filled with both cooperation and conflict. The Avengers, with their superhuman powers and high - tech equipment, would bring a new dimension to Gotham's crime - fighting. But they would also need to respect Gotham's heroes' way of doing things. Gotham's heroes like Batman have a deep understanding of the city's criminal underworld, which the Avengers lack. At the same time, the Avengers' global experience could help Gotham's heroes expand their perspective and perhaps take on threats that are not just local to Gotham.
Lois Lane in Smallville could have an interesting relationship with Supergirl. Lois might be initially skeptical of this new superhero in town. But as she sees Supergirl's selfless acts, she could become an ally and even a friend. And Clark would be in the middle, trying to make sure they both get along. Their relationships would be complex and full of growth as they interact more.
Clark and Barry would likely start off as cautious allies. Clark, being more experienced in the superhero game in a sense, might initially be a bit of a mentor to Barry. But as they face challenges together, they'd become true friends. Lois Lane would probably be intrigued by Barry's speed and his different approach to reporting. She might even try to get some scoops from him. Meanwhile, Chloe Sullivan could help Cisco Ramon with some of his tech issues, and they'd form a bond over their shared love of all things tech - savvy.
I think Rogue would be an interesting main character in a crossover. Her power - absorbing abilities could create some really unique situations, especially when she comes into contact with Clark or other powered individuals in Smallville. On the Smallville side, Lex Luthor could be a main character too. His devious nature and thirst for power could put him at odds with both the X - Men and Clark, making for a complex and engaging story.
In a 'naruto gotham fanfic', Catwoman could be intrigued by Naruto's agility and his different approach to getting around. She might playfully challenge him to a race across the rooftops of Gotham. Meanwhile, Naruto would be trying to understand the complex web of relationships between the heroes and villains in Gotham and would be constantly making missteps due to his lack of knowledge of the city's ways.
I really liked a fanfic called 'Power Convergence'. In this story, the Charmed Ones end up in Smallville and they have to figure out how to get back home. Along the way, they meet Clark and his friends. It's a great read because it shows how the different power dynamics from each show would play out when the two worlds collide.