Well, the Keyblade War story involves a lot of lore. It's about the struggle for the powerful Keyblades. Different groups and individuals with their own motives clashed. This war had a profound impact on the different worlds within the Kingdom Hearts realm. For example, it led to the scattering of many important elements and the rise and fall of key characters. It's a story full of twists, turns, and a lot of heart - as is typical for Kingdom Hearts.
A great fanfic idea could be about a young Keyblade wielder who has no memory of their past but discovers during the Keyblade War that they hold a crucial secret. This could drive the plot as they try to figure out what it is while also fighting in the war.
A fanfic could also explore the different Keyblades in the Kingdom Hearts 3 Keyblade War. Maybe there are hidden abilities or stories behind each Keyblade. The author could create a narrative where the discovery of these secrets changes the course of the war. It could be an exciting way to incorporate more of the Kingdom Hearts lore into the fanfic.
In Kingdom Hearts 3, the Keyblade Graveyard is a place full of significance. It was once the scene of a cataclysmic Keyblade War. As the story goes, Sora and his pals arrive at this graveyard during their quest. There, they are confronted with various threats. The graveyard holds the memories of past Keyblade wielders. It's a place where light and dark forces collide, and Sora has to dig deep within himself to find the strength to fight and prevail against Xehanort and his minions.
One idea could be to explore what would happen if Sora and his friends got trapped in Ariel's underwater world during a Heartless attack. They'd have to team up with Ariel and her friends to fight off the Heartless while also dealing with Ursula's schemes in a new way.
Ursula is an obvious choice as she is the main villain in the original Little Mermaid story. In a Kingdom Hearts fanfiction, she could be even more powerful, perhaps having made a deal with the Heartless or some other dark force to gain more control over the underwater world and other worlds connected to it.
One possible plot could be that Sora and his friends land in the underwater world of The Little Mermaid. Ariel could be in trouble, perhaps captured by the Heartless. Sora, with his Keyblade, would fight to free her. Donald and Goofy could help by using their magic and strength respectively. They would then have to find a way to restore the underwater kingdom's heart which has been affected by the Heartless presence.
Sora is one of the main characters. He is a Keyblade wielder who often finds himself in the middle of the action during the Keyblade War. Riku is another important one, with his own journey and connection to the Keyblades. Xehanort also plays a major role as he has his own dark plans related to the war and the power of the Keyblades.
The Keyblade Graveyard in Kingdom Hearts 3 is a significant location filled with a tragic past. Many Keyblade wielders once fought there, and in the story, it's a place where the final battles take place. Darkness and light clash fiercely. Our heroes face numerous challenges and powerful enemies. Sora and his friends must fight to protect what they believe in and to stop the forces of darkness from taking over completely.
Sora would likely be very protective of Ariel. He would see her as someone in need of help, just like he does with many characters in different worlds. Ariel, on the other hand, would be fascinated by Sora's world and his Keyblade. She might ask him a lot of questions. Donald could get frustrated with Ariel's overly curious nature at times, while Goofy would just be friendly and go along with whatever is happening.