Perhaps they are being forced into the duel by some external factor. For example, an evil villain might be manipulating them, pitting them against each other so that they can't team up and oppose him.
It might be a test of strength. They could both be trying to prove themselves, either to their friends or to some higher power in the fanfiction world. They want to see who is truly the stronger hero.
Maybe they end up in a draw. They both are strong in their own ways. Jason has his lightning powers and leadership skills. They might fight to a point where neither can gain an upper hand and decide to call it a tie.
Well, it could be about a misunderstanding. Maybe there's a rumor that Percy has done something bad to Jason's friends, so Jason challenges him to a fight. Percy, being Percy, doesn't back down and they start fighting. In the end, they realize it was all a big misunderstanding when the real culprit is found.
In a 'percy and jason fight fanfiction', the winner could depend on their mental state. If Percy is more focused and determined, he might be able to outwit Jason. On the other hand, if Jason is more confident and has a better strategy, he could win. Also, their allies could play a role. If Percy has more of his friends to back him up and provide distractions, he could emerge victorious. But if Jason has his crew helping him in a smart way, he might win.
Percy would win. He has a very strong connection to his powers. His control over water is so precise that he can use it in many creative ways during a fight. He can even use water vapor in the air to his advantage. Jason's powers, while strong, are more straightforward compared to Percy's adaptable water powers. Also, Percy has faced more life - threatening situations and has learned to be a better fighter overall in his adventures.
The moment when Percy and Jason first clash is always exciting. Their powers collide, with Percy's water meeting Jason's wind and lightning. It's like a battle of the elements. Then, there's the part where Percy gets surrounded by a whirlpool of his own making and Jason has to figure out how to break through it. Also, when Jason uses his flying ability to gain an aerial advantage and Percy has to come up with a new strategy to bring him down from the sky.
Percy Jackson's main strength lies in his water - based abilities. He can summon water from almost anywhere, which gives him an element of surprise. He can also use water to enhance his physical abilities like speed and strength. His weaknesses include his sometimes - rash decision - making. Jason Grace's strengths are his control over wind and lightning. He can create powerful gusts of wind to knock opponents down and lightning bolts to strike them. His weaknesses are that his powers are more dependent on the weather conditions compared to Percy's. Also, Percy has more experience in hand - to - hand combat, which could be a disadvantage for Jason in a fanfiction fight.
Perhaps they argue over a girl. They are both heroes and might have feelings for the same person. Jealousy and competition could spark an argument between them. Also, their loyalty to different camps, Camp Half - Blood and Camp Jupiter, could be a source of conflict. They might have different ideas on how to handle the relationship between the two camps, which would lead to arguments.
In some fanfictions, the fight might start due to a misunderstanding. For example, they might both be sent on a mission to retrieve the same item. Percy thinks Jason is trying to steal it from him and vice versa. If the fight is in an underground cave, Percy could use the underground water sources to his advantage. He could create water tentacles to grab Jason. Jason could use the air pockets in the cave to create small explosions or gusts of wind to break free. In a different scenario, like in a desert, Percy would have a harder time as there's not much water. But he could still create water from the moisture in the air. Jason would have an easier time controlling the wind in the open desert area.
Jason might hate Percy fanfiction because it often creates scenarios that he finds unrealistic or untrue to the original story. For instance, if the fanfiction pairs Percy with characters in a way that doesn't make sense in the context of the original series, Jason would likely be put off. Another factor could be that the fanfiction might over - sexualize Percy or other characters, which is something Jason would not approve of if he values the integrity of the original characters.
Another reason might be the stress of their quests. They are constantly under pressure to save the world or their friends. This stress can build up and cause them to lash out at each other. For instance, if a quest isn't going well and they keep hitting dead ends, they might start blaming each other for mistakes made along the way.