One idea could be Harry using his Poseidon - given powers to control water in the Triwizard Tournament. For example, in the second task, instead of using gillyweed, he could manipulate the water to his advantage.
A really interesting plot could be a conflict between the wizarding laws and the rules of the Greek gods. Since Harry is the son of Poseidon, he might be bound by certain godly rules that clash with what is allowed in the wizarding world. For instance, using his powers to directly interfere in a wizarding duel might be seen as unfair by some, but necessary according to the godly code he is now part of. This would create a lot of internal and external conflicts for Harry.
One plot idea could be her using her water - based powers from Poseidon to solve magical mysteries at Hogwarts. For example, she might use her ability to control water to find hidden passages that are flooded or blocked by water - based magic. Another idea is that she has to deal with the conflict between her wizarding world and her demigod heritage. Maybe she's targeted by dark wizards who want to use her unique powers, while also facing threats from the mythological world.
One possible plot is that Harry's powers start to manifest in a different way than expected in the wizarding world. Because of his Poseidon connection, he can do things like make water flow upwards or create powerful water - based spells. The Ministry of Magic might be suspicious of him, thinking he's using dark magic. Meanwhile, he gets a visit from a messenger of Poseidon who tells him about his true father. Harry then has to balance his life in Hogwarts and his new responsibilities as Poseidon's son.
A great plot could be Percy getting caught in a power struggle between Athena and Poseidon's followers. Since he is the son of both, he is a symbol of unity or a threat, depending on how different groups view him. He could be forced to prove his loyalty to both sides while also trying to maintain peace among them. This could involve battles, political intrigue, and lots of character development as he tries to figure out where he truly belongs in this complex world of gods and their followers.
A possible plot could involve Harry being drawn to the Underworld to learn more about his mother. There, he meets various figures from Greek mythology who either help or hinder him. His Hogwarts friends might not understand what he's going through, leading to some tense relationships as he tries to balance his two very different worlds.
One idea could be that Harry discovers his true mother is Hela and has to deal with the new identity. He might face discrimination from some in the wizarding world who fear Hela's reputation. Another could be that he inherits some of Hela's powers, like the ability to control the dead in a more magical way than normal necromancy in the Harry Potter universe.
One idea could be that Harry discovers his 'son of Mars' heritage gives him unique combat abilities in the wizarding world, like super - fast reflexes and enhanced dueling skills.
There could be. The world of fanfiction is vast and full of creative and wild ideas. Since both Harry Potter and the concept of Poseidon are well - known in their respective fictional realms, it's not surprising that someone might come up with a story where Harry Potter is Poseidon's son. It allows for new storylines, new powers for Harry, and a whole new take on the familiar Harry Potter story.
Maybe Percy discovers a prophecy that involves both his father Poseidon and Lupa. He has to journey to different realms under the sea and in the Roman wolf - related places. Along the way, he meets new demigods and creatures that either help or hinder him in fulfilling the prophecy.
One interesting plot idea could be Percy having to team up with a demigod child of Leto. They could go on a quest to find a long - lost artifact that has the power to restore balance between the sea and the moon's influence. Since Percy is the son of Poseidon, his control over water and the other demigod's connection to Leto's lunar powers would create a unique dynamic.
One interesting plot idea could be Percy having to deal with the conflicting natures of his 'parents'. Since Gaia represents the earth and Poseidon the sea, he might struggle with controlling both earth - related and sea - related powers. For example, when he's near a beach, he could accidentally cause small earthquakes or make strange things happen to the sea life. Another plot could involve Percy facing a threat that only his unique dual - heritage can defeat. Maybe an ancient evil that is both of the land and the sea, and Percy has to figure out how to combine his powers in a new way to stop it.