In a battle situation, they would complement each other well. Percy's ability to control water could be used for both offense and defense. He could create barriers of water or use it to attack enemies from a distance. Black Widow could use her martial arts skills and weaponry to take on enemies up close. They would need to communicate well to coordinate their attacks and make the most of their respective skills.
Percy would probably be in awe of Black Widow's combat skills at first. He might try to show off his own powers a bit, like making a small water show. Black Widow, on the other hand, would be cautious but intrigued by this strange boy with powers. She would likely start to analyze his abilities and how they could be useful in a fight.
One idea could be that Black Widow is somehow transported into the Percy Jackson universe. Maybe she has to team up with Percy and his friends to defeat a common enemy. Since she has her combat skills and spy training, she could offer a different perspective on battle strategies compared to the demigods.
One possible plot could be that Percy Jackson, with his water - controlling powers, gets transported to the Marvel universe. He meets Black Widow during a mission where they are both after a powerful artifact that has ties to both the Greek mythology in Percy's world and some secret Hydra project in the Marvel world. They start off as distrustful allies but gradually learn to work together and respect each other's skills.
One possible plot could be Percy finding out he has a connection to Black Widow. Maybe he discovers some hidden powers or abilities that are related to her skills. He could then face challenges in the demigod world where his newfound 'Black Widow - like' traits help him out, like enhanced combat skills or strategic thinking.
The plot might involve Black Widow being sent on a mission to investigate some strange happenings that turn out to be related to the magic and mythology of Percy Jackson's world. Percy gets involved because he has knowledge of these things. They start off at odds but as they uncover the mystery together, they start to respect and rely on each other. Their different backgrounds - Percy from a world of gods and monsters and Black Widow from a world of superheroes and villains - would create a lot of room for interesting character development and plot twists.
The two could have some really interesting conversations. Percy could talk about his adventures with Annabeth and the other demigods, while Jacob could share stories about his pack and his experiences in the forest. They might also compare their different kinds of powers. Percy's control over water and his ability to withstand a lot of physical damage compared to Jacob's enhanced senses and super - strength as a werewolf. And they could learn from each other. Percy could teach Jacob some Greek, and Jacob could show Percy how to track better in the wild.
Percy's character might become more stealthy and calculating. He'd probably learn to analyze situations more like Black Widow does. Instead of just charging into battle, he'd think about the best approach first.
A plotline could involve Percy Jackson being sent on a quest that somehow involves the modern world and S.H.I.E.L.D., where Black Widow is involved. They meet, and Black Widow is initially skeptical of Percy's powers and claims. But as they face various challenges together, she realizes his abilities are real. The fanfiction could explore how their two very different worlds and personalities interact and eventually lead to a romantic connection. There could be elements of Percy teaching Black Widow about the demigod world and Black Widow showing Percy some of her spy skills.
A possible main antagonist could be a new character created specifically for this fanfiction. A scientist who has somehow managed to combine Greek magic with Hydra technology. This character could be creating powerful hybrid creatures that are causing havoc in both Percy's world and the Marvel universe. Percy and Black Widow would need to put aside their differences and work together to stop this mad scientist.
In some fanfictions, Hermes interacts with Percy as a mentor. He might offer advice on how to deal with other gods or mythical creatures. For example, he could tell Percy the weaknesses of a particular monster. In other stories, he may be more of an enigma, his actions and words being hard to decipher. Sometimes, Hermes and Percy form an alliance, like when they have to face a common threat together.
The characters would likely start off with some level of distrust. Percy, being a demigod, is used to dealing with his own set of rules and powers. The Black Panther, as the protector of Wakanda, is very protective of his kingdom. For example, when Percy first arrives in Wakanda, T'Challa (the Black Panther) might be on guard. But once they realize they are both fighting for good, they could start to exchange fighting techniques. Percy could show how he uses his sword and powers in combat, while T'Challa could teach Percy some of the Wakandan martial arts moves.