Maybe in the fanfiction, a mad scientist tries to clone Godzilla and use it against the Jaegers. The Jaegers then have to figure out a way to stop the clone while also dealing with the real Godzilla, who is initially hostile but then realizes they have a common enemy. This would involve a lot of action - packed battles and some tense moments of negotiation between the different forces.
One idea could be that Godzilla and the Jaegers team up to fight a new, even more powerful kaiju that is immune to their individual attacks. They have to learn to combine their strengths, like Godzilla's atomic breath with the Jaegers' high - tech weaponry.
One idea could be that Godzilla emerges in the world of Pacific Rim during a Kaiju attack. The Jaegers initially see Godzilla as another threat but then realize he's actually fighting the same enemy. They could team up, with Godzilla's raw power and the Jaegers' advanced technology combining to defeat the Kaiju once and for all.
In this crossover fanfiction, there could be a situation where a powerful Kaiju has some sort of ability that is affecting Godzilla's normal behavior. The Pacific Rim team has to figure out how to reverse this effect while also fighting off other Kaiju threats. They send in their most advanced Jaeger to try and communicate with Godzilla and form an alliance. Along the way, the pilots of the Jaeger learn about Godzilla's history and the ancient battles it has fought against similar threats.
One idea could be that the Jaegers are equipped with Transformer technology. For example, their power cores could be replaced with energon, giving them new abilities. Another plot could involve the Transformers teaming up with the Jaeger pilots to fight a common enemy that threatens both Earth and Cybertron. Maybe a new breed of Kaiju that can also assimilate Transformer technology.
A crossover with the Godzilla universe. Maybe the Jaegers are called in to assist when Godzilla is facing an especially powerful and numerous Kaiju horde. The Jaegers' advanced weaponry and strategic capabilities could complement Godzilla's raw power in this scenario.
One idea could be that the RWBY characters are Jaeger pilots. Ruby could use her speed and Crescent Rose in the cockpit to fight Kaiju. Another is to have Grimm as a new type of threat in the Pacific Rim universe, and the teams have to adapt their fighting styles.
One idea could be a crossover with the Transformers universe. Picture Jaegers and Transformers teaming up to fight a common enemy. Another could be a crossover with the Godzilla franchise, where the Jaegers have to deal with Godzilla while also facing their usual Kaiju threats. A third idea might be a crossover with the Star Wars universe, perhaps with Jaegers having some sort of technology exchange with the droids or the Jedi using their powers in the context of the Pacific Rim battles.
First, you need to study both universes thoroughly. Know the characteristics of the Jaegers, their pilots, and the kaiju in Pacific Rim. For Godzilla, understand his powers and his different forms. Then, come up with an interesting concept like a crossover battle or a team - up. Next, create engaging characters, whether they are new or existing ones from the two universes.
One great 'Pacific Rim and Godzilla Fanfiction' is 'When Titans Collide'. It combines the unique elements of both universes really well. The story has amazing fight scenes between the Jaegers and Godzilla. It also delves into how the two different worlds would interact in terms of technology and strategy.
Godzilla himself is of course a key character. Focusing on his perspective could be really unique. Maybe we see his thoughts as he encounters the Jaegers and these strange new kaiju. We could explore his instincts and how he decides whether to fight or cooperate with the humans and their giant machines.
One possible plot could be that Naruto and his friends discover a portal that leads to the world of Pacific Rim. There, they learn about the Kaiju and the Jaegers. Naruto, with his chakra powers, could potentially be a great asset in piloting a Jaeger. He might even develop a new form of combat style that combines his ninja techniques with the technology of the Jaegers.