Another aspect of developing the plot is to consider the power dynamics. The Poseidon princess likely has certain powers related to the sea. She could use these powers to either help or hinder the progress of the story. For example, she might use her ability to create tidal waves to stop an approaching army. But this could also attract unwanted attention from other powerful entities. Also, think about the overarching goal of the story. Is it to restore Poseidon's glory? Or is it something more personal for the princess, like finding a lost relic of her father's? This will shape the entire plot of the fanfic.
One way to approach a God of War 3 Poseidon princess fanfic is to consider her backstory. She could be a princess who was once in a privileged position but now has to face the consequences of the fall of Poseidon. Her story could be one of survival and redemption. In the fanfic, she might have to make difficult choices, like whether to side with the remaining gods or try to find her own path. This would make for an interesting character arc, especially if it intersects with the main events of God of War 3 in unexpected ways.
Perhaps the princess is a peacemaker. In a world where the God of War is constantly causing unrest and Poseidon is often at odds with other gods, she tries to broker a peace deal. But her efforts are seen as a threat by the God of War, who wants chaos. Poseidon, on the other hand, starts to respect the princess and decides to help her in her mission, leading to a series of adventures and confrontations.
One possible fanfiction could be about the Princess having a secret alliance with Poseidon. Maybe she was promised power in exchange for helping him against Kratos. However, as the story unfolds, she realizes the true nature of Poseidon's brutality and has a change of heart, ultimately choosing to side with the forces of good instead.
A simple plot could be that the Princess is a sea nymph in love with Poseidon. But Poseidon's war - mongering ways put their relationship at risk. She tries to convince him to stop his aggression in the God of War 3 universe, but he is too consumed by his desire for power and dominance.
Another scenario could be that the princess is from a land that both the God of War and Poseidon have an interest in. The God of War wants to conquer it, while Poseidon wants to keep it as a neutral zone. The princess then becomes the key figure in this conflict. She might form an alliance with other powerful beings or use her own wits and courage to save her land from destruction.
To develop Poseidon's character, focus on his connection to the sea. Describe how his moods are like the changing tides. For example, when he's angry, the seas rage. Show his pride in ruling the oceans. For Hades, emphasize his loneliness in the underworld. Maybe he has a longing for something more than just ruling the dead, like a connection to the living world which he can't fully have.
The fanfic could also explore how Poseidon's actions towards Percy affect Sally. For example, when Poseidon claims Percy as his son, Sally might have mixed feelings. On one hand, she's proud that Percy has a powerful father, but on the other hand, she's worried about the dangers that come with being a demi - god. This could create a complex dynamic between the three characters.
His powers could develop in a very unique way. Since he has the blood of Chaos, his powers might start off as small, random bursts of energy. For example, he might accidentally create small pockets of chaotic space. As he learns to control his Poseidon powers, like controlling water, he could start to merge the two. He might be able to make the water act in chaotic ways, like creating whirlpools that have unpredictable movements.
First, decide on your OC's backstory. If your OC is a survivor of a planet Thanos has already destroyed, their motivation to stop him will be strong. Then, tie their story into the main events of Infinity War. For example, they could be searching for a way to reverse the damage Thanos has done while the Avengers are fighting him directly.
The story order develops as Kratos' character evolves. Initially, he is a solitary and angry figure. But when Atreus enters his life, things change. Their journey together is what drives the story forward. They encounter different obstacles which are in a sequence that gradually reveals more about the world's lore and their own destinies.