In this crossover fanfiction, the plot might revolve around a quest to save both the Pokemon world and the God of War world. A powerful villain could be threatening to merge the two worlds in a chaotic way. The main characters from both universes, like Ash from Pokemon and Kratos from God of War, would have to team up. Ash's knowledge of Pokemon and Kratos' combat skills would be combined to face this new threat. The Pokemon would also have to adapt to the more brutal and dark environment of the God of War world.
Well, it could be that Kratos discovers Pokemon in his journey. He might initially be confused but then realize their potential in combat. The Pokemon, on the other hand, would be in awe of Kratos' strength. Maybe some of the God of War monsters start to have Pokemon - like abilities due to some magical cross - over event, leading to a whole new set of battles and power dynamics.
Arcanine. This majestic and powerful fire - type Pokemon has a look of a noble beast. In the God of War world, it could be seen as a symbol of power, like the mythical beasts there. It could use its fire attacks to fend off the hordes of demons and other enemies.
Another possibility is that there is a new threat that emerges from the combination of the two universes. Some sort of evil entity that has the powers of both the Naruto universe, like the ability to use chakra, and the dark magic from the God of War world. Naruto and Kratos would have to learn to trust each other quickly in order to stand a chance against this new foe. They might start off at odds with each other due to their different backgrounds and fighting styles, but eventually realize that they need to work together.
One possible plot could be that Kurosaki Ichigo from Bleach somehow gets transported to the world of God of War. He might team up with Kratos. They could face off against a new threat that combines the Hollows from Bleach and the monsters of God of War. For example, Hollows with the strength and brutality of the Cyclops. Ichigo's Zanpakuto skills would be interesting to see combined with Kratos' brute force combat style.
A plot could involve Baldur being sent to the realm of God of War by Odin to spy on Kratos. However, Baldur is intrigued by Kratos' strength and his relationship with his son, Atreus. Baldur starts to question his own loyalty to Odin. Meanwhile, Kratos is suspicious of Baldur but also sees a bit of his own past self in Baldur's blind obedience to a cruel father figure. Eventually, they work together to resist Odin's control over Baldur.
The plot might involve Naruto being mistaken for a new kind of demigod in the God of War world. He has to prove himself while also trying to find a way back home. Along the way, he learns about Kratos' tragic past and they form an unlikely bond. His jutsu like the Summoning Jutsu could bring in some unique creatures to the battles in that world.
The plot might involve Harry Potter being transported to the world of God of War. He'd be completely out of his element, but his courage and quick thinking would help him survive. He could team up with Kratos. Harry could use his magic to assist Kratos in battles against the mythological creatures there. They might discover that the dark magic in the God of War world has similarities to the dark magic in the wizarding world, and together they work to stop a powerful evil force that threatens both realms.
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 possible plot could be that Kratos, from God of War, somehow ends up in the Assassin's Creed universe. He teams up with an Assassin, perhaps Ezio. Together, they face a common enemy that threatens both their worlds. This enemy could be a powerful Templar who has acquired some of the dark magic from Kratos' world.
One of the most interesting aspects of a Perseus Jackson in God of War fanfiction could be his relationship with Kratos. Kratos is a complex and powerful character. Perseus, with his own set of values and beliefs, might either become an ally or an adversary to Kratos. They could learn from each other's combat styles and experiences, or they could be at odds due to their different views on the gods and their roles.
A possible plot could be that Godzilla is accidentally teleported into the Pokemon world. The Pokemon trainers think he is a new, extremely powerful and dangerous 'Pokemon'. So they try to stop him. But as they try to fight Godzilla, they realize that their normal attacks have little to no effect. Then, a group of legendary Pokemon, such as Arceus and Lugia, decide to communicate with Godzilla. They find out that Godzilla is just as confused as they are about this new world. Together, they try to find a way to send Godzilla back to his own world while also dealing with the chaos that his presence has caused in the Pokemon world, like disrupted ecosystems and panicked Pokemon.