What are some interesting concepts in Kingdom Hearts Darkness fanfiction?

Well, in Kingdom Hearts light and darkness fanfiction, the idea of alternate universes where the roles of light and darkness are reversed can be really cool. It makes you see the characters in a whole new light. Also, the concept of a character's inner struggle between light and darkness can be delved into more deeply than in the original games. Fanfiction can show how a character might gradually be consumed by darkness or find new ways to embrace the light.

Some interesting concepts include alternate universes where the characters have different roles or relationships. For example, Sora might be a villain instead of a hero. Another concept could be exploring the backstories of minor characters in more depth, like how they came to be in the different worlds.

One interesting concept could be the exploration of the darker sides of the characters. For example, seeing how Sora might struggle with darker impulses or a corrupted Keyblade. Another could be alternate universes where the Heartless have completely overrun the worlds and the heroes have to fight in much more dire circumstances.

One interesting concept could be a new original character (OC) with a unique Keyblade design. For example, an OC whose Keyblade is shaped like a musical instrument, representing their love for music and how it ties into the power of the Keyblade. This could add a fresh dynamic to the battles and interactions in the Kingdom Hearts 3 universe.

One concept could be Naruto and his friends being Keyblade wielders. They could travel between different worlds in the Kingdom Hearts style, using their ninja abilities along with the power of the Keyblade. For instance, Naruto's Rasengan could be combined with a Keyblade attack. Another idea is that the Akatsuki are like the Organization XIII in Kingdom Hearts, with each member having their own unique powers and goals related to both the Naruto world and the Kingdom Hearts concepts of hearts and darkness.

One idea could be creating an OC who is a keyblade wielder from a forgotten world consumed by darkness. This OC could be on a journey to find a way to restore their world while also struggling with the allure of the darkness within them.

One interesting concept could be exploring the backstory of the Master of Masters in more depth. Maybe his origins, his true motives for his actions in the Kingdom Hearts universe.

One interesting concept could be the crossovers with other popular franchises. For example, a crossover with Final Fantasy might bring unique character interactions. The different worlds in Kingdom Hearts already have a diverse range of characters and settings, and when combined with elements from other stories in fanfiction, it can create really engaging scenarios. Maybe a character from Kingdom Hearts visits a world based on a different game or movie, and has to adapt to new rules and cultures.

One interesting concept could be the exploration of different worlds colliding. For example, the Heartless from Kingdom Hearts might enter a world from another franchise in the crossover. This could lead to unique battles and interactions between characters that wouldn't happen in the original Kingdom Hearts universe.

One interesting concept could be the unique character designs of the self - inserted original characters (OCs). They often bring fresh perspectives and abilities into the 'Kingdom Hearts' universe. For example, an OC might have a special power related to the Keyblades that we haven't seen in the original game series. Another concept could be the new storylines that are created around these OCs. They can interact with the existing characters in unexpected ways, like befriending Sora or Riku and going on adventures with them that deviate from the main game plot.