Definitely Daredevil. As I mentioned before, their different moral compasses would create great tension. Elektra could also be included. She has a more ambiguous moral code and her skills would make her a formidable presence in a story with the Punisher.
A crossover with Spider - Man could be cool. Imagine Spider - Man trying to stop the Punisher from killing a bad guy. Spider - Man believes in rehabilitation while the Punisher thinks the only way to stop crime is to eliminate the criminals. This conflict could drive an interesting story.
In some fanfictions, the Punisher may develop a sense of camaraderie with Batman. This would be a big change as he is usually a lone wolf. But through shared battles and mutual respect for their skills, he could start to rely on Batman and be more open to teamwork, which is a significant shift from his character's normal solitary nature.
Well, in 'batman vs punisher fanfiction', one of the most interesting aspects is the clash of their moral codes. Batman has his no - killing rule, while Punisher is all about extreme justice through killing criminals. This creates a huge contrast and source of conflict in the fanfiction.
One common theme is the clash of different worlds. Percy comes from a world of magic and myth, while the Punisher is rooted in a gritty, modern - day crime - fighting setting. So, there's often exploration of how these two disparate worlds interact.
One common theme is revenge. Just like the original Punisher, the female version often seeks revenge for some wrong done to her or someone she cares about. It gives her the motivation to take on the bad guys.
In fanfiction, the Punisher's entry into the Avengers is often a bumpy ride. His methods are so different from the Avengers'. He might start as an adversary to some of the Avengers who don't approve of his killing ways. But as the story progresses, he could prove his worth. He can offer a different perspective on combat and strategy. He might be the one to take on the dirtiest jobs that the more 'heroic' Avengers are reluctant to do. This creates an interesting dynamic within the team, as they have to balance his presence with their own moral code.
In some Punisher Batman fanfiction, the setting might be a Gotham overrun by more extreme and violent criminals. The Punisher could come to Gotham thinking he can clean it up better than Batman. This would lead to a power struggle and also a chance for them to learn from each other's techniques.
The theme of power also shows up a lot. The Punisher has his own set of skills and weapons, and when he enters the Fairy Tail world, there's a comparison between his power and the magic of the Fairy Tail characters. Some fanfictions explore how he can hold his own or even gain new powers in this new magical setting.
One key element is the contrast between their personalities. The Punisher is more of a lone - wolf vigilante with a very direct and brutal approach to justice, while Black Widow has a more complex past with espionage and a different set of skills. Their coming together often creates a lot of tension and interesting interactions.