Some 'kingdom hearts fanfic' are centered around the Keyblades themselves. They might explore the origin of different Keyblades or the hidden powers within them. There could be a story where a new Keyblade is discovered, and it has a unique connection to an ancient power. This kind of fanfic often dives deep into the lore of the Kingdom Hearts universe.
Well, I'm not really into promoting adult fanfiction as it often goes against the spirit of the original work. But if we consider general Kingdom Hearts fanfiction, there are many great ones that focus on the relationships between the characters like Sora, Donald, and Goofy. They might explore different adventures or alternate universes that are in line with the game's themes.
One popular theme is alternate universes. Fans create stories where the characters exist in a different reality. For example, a world where Sora never picked up the keyblade and how that changes the fate of the different worlds. Another theme is crossovers with other non - sexual franchises. It could be a crossover with a Studio Ghibli world, where the 'Kingdom Hearts' characters interact with the unique characters and settings from those movies.
A common plot involves Axel's relationships. For instance, his friendship with Roxas. Fanfics might explore what would have happened if he had been able to save Roxas from his fate in the original story. Also, his interactions with other key characters like Kairi or Riku can form interesting plots.
A common trope is the 'lost in a new world' trope. For instance, a Star Wars character could end up in the Kingdom Hearts universe and be completely bewildered by the different rules and magic there. Or vice versa, a Kingdom Hearts character in the Star Wars galaxy would be shocked by the technology and different cultures.
There might not be a lot of well - known ones widely publicized. You could start by joining Kingdom Hearts fan communities and asking around. Maybe someone there has a favorite Futa on Male fanfiction in the Kingdom Hearts universe. Keep in mind that fanfiction can vary greatly in quality and content.
The Kingdom Hearts and Harry Potter crossover is quite popular. You can have Sora and his friends exploring Hogwarts. The contrast between magic in the two universes is fascinating. For instance, Keyblade wielding in the halls of Hogwarts is an amazing concept.
It's hard to say for sure. While there may be a niche group of fans who are interested in 'Kingdom Hearts lemon fanfictions', it's not likely to be as mainstream as regular Kingdom Hearts fanfictions. These types of fanfictions often contain content that might not be suitable for all audiences, which can limit their popularity.
The struggle between light and darkness is a big theme in 'Kingdom Hearts' fanfics. Writers might create stories that show how characters are tempted by the darkness or how they fight to preserve the light. Additionally, the relationships between the main characters and the new characters introduced in the game can be a theme. For example, how Sora befriends characters from new worlds he visits. And the concept of saving the worlds from the threat of the Heartless and other villains is also a popular theme.
Some Kingdom Hearts 3 crossover fanfictions cross over with the Pokémon universe. Imagine Sora traveling to the Pokémon world, where he has to catch Pokémon instead of using the Keyblade all the time. He could form a team of Pokémon and use them in battles against Heartless that have invaded the Pokémon world. The concept of friendship and growing stronger with your companions, which is central to both Kingdom Hearts and Pokémon, is emphasized in these crossovers.
A Kingdom Hearts fanfic might be considered cumbersome if it has overly complex plotlines. For example, if the author tries to incorporate too many characters from different parts of the Kingdom Hearts universe all at once, it can become confusing. Also, if the writing style is overly wordy and filled with long, convoluted descriptions that don't really add to the story, it can make the fanfic cumbersome.