Another plot could be that an ancient prophecy in the One Piece world foretells of a 'Luffy God of War' who will bring about a new era. Luffy then has to fulfill this prophecy while dealing with his own doubts and the expectations of his crew and the people he has met on his journey.
Perhaps in this fanfiction, Luffy is transported to a realm where he has to prove himself as the God of War. He could face challenges that test not only his physical strength but also his leadership and strategic thinking, which are also important aspects of being a God of War.
A cool god of war fanfiction could be set in an alternate universe where the gods have different personalities. For example, Zeus could be a benevolent figure instead of the antagonist. Kratos might have to deal with this new dynamic and how it affects his own journey of vengeance. You could also write about a fanfiction where Kratos has to train a young apprentice, passing on his skills and wisdom.
One idea could be Kratos arriving in the RWBY world and getting involved in the fight against the Grimm. His combat skills and Spartan rage would be a huge asset. Maybe he teams up with Ruby and her friends, teaching them some of his more brutal combat techniques.
One idea could be that the god is actually an ancient entity sealed away long ago. Naruto discovers a way to communicate with it during the chaos of the 4th war. Maybe the god offers Naruto a deal to end the war quickly but at a great cost to himself, like sacrificing his ninja way. This would create a great internal struggle for Naruto.
One idea could be a crossover with Norse mythology outside of the God of War series. For example, Kratos could meet Thor from the original Norse tales. Another could be a crossover with Greek and Roman mythology, where Kratos encounters some of the forgotten or lesser - known Roman gods. Maybe a crossover with a popular fantasy world like Middle - earth, and Kratos has to face off against some of the powerful beings there.
Well, perhaps in 'naruto god of war fanfiction', there's a plot where Naruto has to face a new kind of enemy that can only be defeated by combining the magic and abilities from the God of War universe with his own ninja skills. Maybe he has to journey through a realm similar to those in God of War to gain new powers or weapons. Another idea could be that Naruto teams up with a character from God of War, like Atreus, and they learn from each other's combat techniques.
A crossover with another popular action - adventure game like 'The Witcher'. Geralt and Kratos could meet in a world that is a blend of their two universes. They might initially be at odds due to their different moral compasses, but then find common ground in fighting a powerful, otherworldly enemy that neither could defeat alone. This would create an interesting dynamic between their combat styles and personalities.
One idea could be exploring Kratos' relationship with his son in more depth. Maybe show them facing a new and powerful enemy together and how their bond grows through that. Another could be delving into the backstory of the new characters introduced in the new God of War, like the dwarves or the new gods, and creating a story around their pasts and how it intersects with Kratos' journey.
A God of War 4 crossover fanfiction could involve crossing over with the DC universe. Kratos could find himself in Gotham City and have to deal with the likes of the Joker and Batman. His no - nonsense attitude and brute strength would be a contrast to the more morally complex characters in the DC world. Or perhaps a crossover with the Legend of Zelda series, where Kratos and Link could exchange combat techniques and embark on a joint adventure.
Perhaps a story where the God and Goddess of War have a sibling rivalry. They compete for the most powerful weapon in the war - realm, and in the process, they have to face various challenges and make difficult choices that test their loyalty to each other and their own beliefs.
A possible plot is that Fem Luffy accidentally gets involved in one of Smoker's investigations in a new island. She initially seems like a hindrance to him, but as the story progresses, they find out that there is a much larger conspiracy at play that involves both the Marines and some powerful pirate groups. They have to work together to expose the truth, and during this time, a strange friendship starts to form between them.