It's really hard to say. Voldemort is extremely powerful in the world of magic. He has a wide range of dark spells at his disposal. However, Percy Jackson is no slouch either. He has faced numerous powerful foes in his own universe. If the fight takes place in an area with a lot of water, Percy has a huge advantage. But if it's in a more magical setting like Hogwarts, Voldemort might be able to use the environment to his benefit. So it could go either way depending on the circumstances.
A really interesting plot twist might be that Voldemort and Percy are forced to team up against a common enemy. They realize that there is a greater threat that neither of them can face alone. This would be a huge change in their relationship as they are initially enemies. Or perhaps Percy discovers that he has some latent wizarding abilities due to his godly heritage, which completely changes the dynamics of the fight as he can now use both his demigod powers and magic.
There might be. Fanfiction is a place for creativity to run wild. Imagine Percy Jackson suddenly showing up in the wizarding world where Voldemort rules. Percy's powers are not based on magic as Voldemort knows it. His ability to summon water in a place like Hogwarts could be a huge shock. Voldemort, who is used to being the most feared in his world, might be scared when faced with a being like Percy who has such different and potentially overwhelming powers.
Because Percy has powers from the gods. He can control water, which could be used to great effect against Voldemort. For example, he could flood areas or create water - based attacks that Voldemort may not be able to defend against easily.
In fanfiction, they could be related via a magical curse. A curse placed on Percy's family in the past by a dark wizard related to Voldemort could be the link. This curse could have some strange effects that tie their fates together. For example, Percy might be the only one who can break the curse and defeat Voldemort. Another way is if there is a secret magical society that both Percy and Voldemort are unknowingly part of, and the rules of this society create a relation between them, like they are both heirs to some powerful magic within the society.
No. Percy Jackson's world is based on Greek mythology, while Voldemort is from the wizarding world of Harry Potter. Fanfictions might try to mash them up, but usually Percy has his own adventures and enemies in his own myth - based universe and is not related to Voldemort's heir. Unless a fanfic writer decides to do some wild crossover and come up with a really out - there reason for a connection.
There's no official connection between them in the original series. But in fanfiction, anything can happen. Some fanfictions might make Percy Jackson cross paths with Voldemort's heir if the author wants to explore a crossover scenario. It could be a really interesting concept, like Percy having to deal with the dark magic of Voldemort's heir in a world that combines Greek mythology and Harry Potter magic.
His mother, Sally Jackson, could play an important role as an ally. She has a strong will and has always been there for Percy. Also, Tyson, his cyclops half - brother, could be a powerful ally with his strength and loyalty. And don't forget about the Nymphs. Some of the water nymphs might help Percy since he has a connection to water.
In a fanfiction where Percy Jackson was captured by Voldemort, a lot of things could occur. Percy's friends from Camp Half - Blood would surely try to rescue him. They might team up with some of the more brave and good - hearted wizards from Hogwarts. Voldemort might be intrigued by Percy's unique abilities and try to study him. However, Percy would not go down without a fight. He could potentially call upon his father Poseidon for help, which could lead to some really epic and unexpected events. For example, Poseidon could flood Voldemort's lair if he knew where Percy was held captive, causing chaos among Voldemort's Death Eaters.
Well, in a fanfiction, a plotline could be that Percy Jackson is on a quest and somehow crosses paths with Voldemort. Voldemort senses Percy's power and wants to study it. Percy, not knowing much about the wizarding world, initially mistakes Voldemort for just another monster. As they interact more, they realize that their worlds are more intertwined than they thought. Another plot could involve a powerful artifact that both of them are after. The artifact has the power to change the balance of both their worlds. So they are in a race against each other to get it, but along the way, they start to understand each other's motives and might even consider working together to keep the artifact out of the wrong hands.