One idea could be a crossover where the keyblade wielders from Kingdom Hearts end up in the world of Blade. They could team up with the Blade warriors to fight a new threat that is a combination of Heartless and the vampires from Blade. Maybe Sora discovers that his keyblade has new powers when used against the vampires.
One interesting storyline could be Sora and Blade teaming up to face a new, powerful enemy in a world that combines elements from both their universes. They might have to learn to combine their unique combat styles to defeat this foe.
Sora would be really interesting. His naivete and pure heart could be a great contrast to the dark and gritty world of Blade. He would probably approach the vampire - fighting situation with his usual optimism and might even try to find a way to redeem some of the vampires, thinking they are like the lost souls he has saved in the Kingdom Hearts worlds.
Perhaps a plot where the keyblade wielders are summoned to the Queens Blade world because there is a strange darkness emerging that is similar to the Darkness in Kingdom Hearts. Kairi could form a special bond with one of the Queens Blade heroines. They would then work together to figure out the nature of this darkness. The story could explore how the magic and power systems of both worlds interact and how the characters adapt to being in a new and strange world.
Yes, in some fanfictions Sora might be depicted as afraid of X. Fanfiction writers often explore different aspects of characters' personalities, and fear can be an interesting trait to give to Sora. It could add depth to his character and create new storylines.
Riku and Alleyne would make a great pair. Riku has his complex past and his strong will. Alleyne is a skilled fighter. They could have some really intense battles side by side and also have deep conversations about their respective worlds and their goals. Riku might be able to teach Alleyne some new ways of using her sword, and she could show him different combat strategies from the Queens Blade world.
One idea could be a crossover where the characters from Kingdom Hearts find themselves in the world of Blade. They could team up with the Blade warriors to fight against a common enemy, like a new form of Heartless that has emerged in the Blade universe. This would lead to interesting interactions as they learn about each other's powers and worlds.
Fans often portray them as having a very dynamic relationship. Sometimes it's a mentor - mentee type of relationship, with Blade teaching Sora some of his darker and more edgy combat moves.
There's a fanfiction called 'Under the Stars with Sora' which is quite charming. It's a more slow - paced story that focuses on the tender moments between Sora and the main character. The descriptions of the settings, like the different Kingdom Hearts worlds at night, are very vivid, creating a really immersive reading experience for fans of the series.
In these fanfictions, the author has a lot of creative freedom. They can shape the OC to be whatever they want. The OC could be from a completely different background than the characters in the original Kingdom Hearts. This can lead to interesting plotlines. For instance, if the OC is from a world based on ancient mythology, it can introduce new enemies and challenges for Sora and the OC to face together.