One common theme is the clash of different moral codes. For example, when Daredevil crosses over with characters like Punisher, their views on justice can be very different. Another theme is teamwork. Characters from different backgrounds have to learn to work together.
One possible plot could be that Daredevil and Batman are both on the hunt for a new criminal mastermind in Gotham. This criminal has a unique way of operating that blurs the line between legal and illegal in a way that challenges both of their moral compasses. They initially clash due to their different methods, but then realize they need to work together to take down this new threat.
Another interesting one is 'Daredevil and Jessica Jones: Allies in the Dark'. It's set in a world where both characters have to team up to take on a powerful and mysterious criminal organization. The author does a great job of capturing their personalities and the gritty atmosphere of their shared world.
Batman is very much a loner who plans everything meticulously. Daredevil, on the other hand, is more impulsive and often dives right into situations. Their different approaches would likely cause clashes. For example, Batman would want to spend time researching and setting up a trap for a villain, while Daredevil might just want to go after the bad guy immediately.
Kingpin would be a very suitable main villain. He has his criminal empire in Hell's Kitchen already, and if he decides to make a move on Gotham, it would bring him into conflict with Batman. His power, wealth, and ruthlessness would make him a formidable foe for the two heroes to face together.
Well, perhaps a plot where a powerful and mysterious villain frames both Batman and Daredevil for crimes they didn't commit. They have to work together to clear their names while also dealing with the chaos the false accusations are causing in their respective cities. Batman uses his resources and intellect, and Daredevil uses his street - level knowledge and fighting skills to uncover the real culprit.
Jigsaw could also work well. His insanity and penchant for creating chaos would be a big threat to both Daredevil and Jessica Jones. He could be targeting people in both of their circles, leaving a trail of mayhem that they have to follow. His unpredictable nature would add an element of danger and keep the story tense as they try to figure out his next move.
One common theme is the clash of different ideologies. For example, when Daredevil crosses over with a more powerful hero like Thor, there's often a contrast between Daredevil's street - level justice and Thor's more cosmic view of right and wrong.
Maybe a common enemy from their past resurfaces. This enemy has a vendetta against both of them and is using their knowledge of Daredevil and Jessica Jones' weaknesses to try and take them down. They have to put aside their differences and figure out a way to stop this person before it's too late. For example, the enemy could be a former associate from one of Jessica's PI cases who also has a connection to Daredevil's world of crime - fighting in Hell's Kitchen.
Well, one possibility could be that Daredevil and Arrow find themselves in a common enemy situation. Maybe a powerful crime syndicate that operates in both their cities. They start off as strangers but soon realize they can help each other. They could combine their skills, Daredevil's enhanced senses and martial arts with Arrow's archery and parkour skills. And they'd have to learn to trust each other's methods which could lead to some interesting character moments.