For Kyogre, it could be characterized as a powerful but somewhat solitary being. It's protective of the oceans and views any threat to the seas as a direct attack. It's majestic and its movements are fluid like the waves. Groudon, on the other hand, is a force of the land. It's stubborn and proud, believing that the land is the most important part of the world. It's slow to trust but once it does, it's a loyal ally.
In a fanfic, Groudon can be seen as a proud and territorial being. Since it represents the land, it guards its territory fiercely. It has a sense of honor and dignity associated with its role as the keeper of the earth. Kyogre can be characterized as a wise and ancient entity. It has seen the ebb and flow of countless years beneath the ocean waves. It is patient but when provoked, it can call upon the power of the entire ocean to defend itself. They both can be shown as having a mutual respect for each other's power deep down, even though their natures often put them at odds.
A plot could also revolve around a new type of power - enhancing crystal that has been discovered. Kyogre and Groudon both want it to boost their own strength. A group of trainers get caught in the middle of their struggle. They have to figure out a way to either stop the two Legendary Pokemon from fighting over it or find a way to share the crystal's power between them to maintain the balance in the world.
A great fanfiction idea could be a time - travel story involving Groudon and Kyogre. A trainer travels back in time to the era when Groudon and Kyogre first started their feud. The trainer tries to prevent the feud from ever starting, but in doing so, he accidentally disrupts the balance of nature in that time period, leading to new and unexpected challenges.
One popular 'kyogre x groudon fanfic' is 'The Clash of Titans'. It really delves into the relationship between Kyogre and Groudon in a unique way. The story sets up an interesting scenario where they have to work together despite their natural enmity. It's full of action and also some great character development.
To develop Groudon's character, you could focus on its fiery nature. Show how it's not just about destruction but also about the renewal of the land. For Kyogre, emphasize its connection to the vastness of the ocean and its role in maintaining the balance of marine life. You could give them internal thoughts, like Groudon might be frustrated with always being seen as the one causing droughts, and Kyogre with being blamed for floods.
Well, it could be about their eternal struggle in a new light. Maybe in a world where they have to team up against a greater threat. For example, a new powerful Pokemon that is causing chaos in their shared ecosystem. Their powers combined could create a unique dynamic.
One common theme is the struggle between their opposing natures. Kyogre is a water - type and Groudon is a ground - type, so their elements are at odds. But in fanfiction, this can be a source of tension and attraction. Another theme could be the idea of them finding common ground despite their differences, perhaps to save the Pokemon world together.
The potential for unique relationships. They can be rivals, but also in some fanfics, they become friends or even more. Their relationship can be explored in many different ways, like in some fanfics where they learn to understand each other's importance in the Pokémon ecosystem.
I'm not sure specifically as I haven't read that exact fanfic. But generally, a fanfic about Groudon and Kyogre might explore their relationship in the Pokemon universe. It could be about their battles, their coexistence, or some fictional scenarios where they interact in unique ways.