Megaman Zero might fit in as an unexpected visitor. He could land in Gotham City by accident and then get involved in Batman's battles. His combat skills and advanced weaponry would make him a formidable force in the dark alleys of Gotham.
Well, in a Megaman Zero in Batman fanfiction, we might see Megaman Zero adapting to Gotham City. He would likely be a bit out of place at first. His high - tech abilities could either be a great asset or draw unwanted attention. And Batman would be initially suspicious of this new, powerful figure in his city. They could start off as adversaries and then gradually realize they have common goals and start working together.
Batman in a Marvel fanfic would be a very interesting addition. His detective skills are top - notch, which could rival characters like Daredevil. He might have a hard time adjusting to the more super - powered and otherworldly elements in the Marvel universe compared to Gotham. But his intelligence and resourcefulness would make him a valuable asset to any team, perhaps even working with the Avengers on a mission that requires his particular set of skills.
Batman would fit in by being the ultimate strategist. The Avengers sometimes jump into action without a fully thought - out plan. Batman's meticulous planning would force them to be more organized. He could also provide a more grounded perspective. Many of the Avengers have superpowers and deal with large - scale threats from outer space or magic realms. Batman, coming from the streets of Gotham, would remind them of the importance of protecting the everyday people.
Superman could fit in as an outsider at first. He'd be this super - powerful being that the Marvel characters don't really understand. His powers might be seen as a threat initially. But over time, he could become an ally. For example, he could help the Avengers during a major crisis, like an invasion from another dimension. His flight and heat - vision would be useful assets.
Well, Vegeta could be a sort of anti - hero in the DCU. His aggressive nature and desire for power could put him at odds with some of the more morally upright heroes like Superman. But at the same time, his strength would be respected. He might form an uneasy alliance with characters like Lex Luthor who also have an interest in power, though their goals would be different.
Well, Goku's extreme power level could make him a sort of legend in the Naruto fanfiction world. His Saiyan abilities like the Kamehameha and Super Saiyan forms would be completely foreign to the ninjas. He might be seen as an otherworldly being, and his presence could disrupt the power balance. Maybe he'd come to the Naruto world seeking a new challenge, or perhaps he was accidentally transported there.
He could be a comical informant. Since he has a knack for getting into strange situations in his own show, he might have valuable, if not always reliable, information for Batman about the criminal underworld.
Well, in fanfiction, Ichigo could be a new kind of Force user. His connection to his zanpakuto could be like a Jedi's connection to their lightsaber, but much deeper. Since he has to constantly battle his inner Hollow, it could be like a struggle with the dark side of the Force. He might be recruited by the Jedi Order to help them understand this new type of power, or he could be seen as a threat by the Sith who want to corrupt him and use his power for their own gain.
It would be a very difficult fit. Since the wizarding world has its own norms like monogamous relationships in most cases (like the marriages we see in the series). If one were to introduce concubines, it would have to be in an alternate universe where the social and moral values are completely different. Maybe in a fanfic where the wizarding world is modeled after a more ancient and permissive society, but this would be a huge departure from the original feel of the Potterverse.
Mileena could be a foreign exchange student of sorts from a different magical realm. Her unique appearance and combat skills would make her stand out at Hogwarts. She might have trouble adjusting to the more academic and rule - based magic of the wizarding world compared to her own more instinctive and combat - focused magic.