One idea could be that Wolf and Virginia get separated from the group again in a new magical land. Wolf has to use his wolf - like instincts to protect Virginia from unknown creatures. Another could be a story where they go back in time within the 10th Kingdom and have to change a certain event to save the future of the kingdom, all while their relationship deepens.
Perhaps a fanfiction where Wolf discovers a new power within himself, and Virginia has to help him control it. They could be on a quest to find a wizard who can teach Wolf how to use this power properly. Along the way, they face challenges that test their loyalty to each other and to their friends in the 10th Kingdom.
One idea could be exploring the backstories of the minor characters in the 10th kingdom. Maybe a story about the life of a random villager and how the events of the main story affected them.
Well, if they start to learn more about each other's pasts, it can deepen their relationship. Maybe Wolf reveals more about his life as a wolf - man before he met Virginia, and Virginia shares her dreams and fears. This new level of understanding can lead to a more profound emotional connection between them. Also, if they have to make sacrifices for each other, like Wolf giving up his freedom for a while to save Virginia or vice versa, it would show the depth of their love.
One idea could be exploring the backstories of the new characters introduced in Kingdom Hearts 3 in more depth. For example, you could write about how they came to be in the different worlds and what their true motives are.
A great plot could be about a female character from 'last kingdom fanfiction' who disguises herself as a man to join the army. She then has to constantly hide her identity while also dealing with the challenges of war and her growing feelings for one of her comrades.
Perhaps the black wolf is actually a cursed prince and the fanfiction could focus on his journey to break the curse. He might meet a kind-hearted maiden who helps him along the way.
Often, the wolf in this context is a plot device. It can be used to drive the story forward, for instance, if the main character has to find a way to either befriend or defeat the wolf. It adds an element of adventure and danger to the fanfiction.
The wolf in the 10th Kingdom often represents mystery and danger in OC fanfiction. It can be a symbol of the wild and untamed nature that the characters have to face. Sometimes, it might be a character's spirit animal or a form of a cursed transformation.
One idea could be that the Heartless somehow find their way into the Marvel universe and start attacking various locations. The Avengers, being the protectors, team up with Sora and his friends from Kingdom Hearts. They initially have some clashes due to different fighting styles and ways of understanding the world, but eventually learn from each other and combine their powers to defeat the Heartless. For example, Iron Man could use his technology to analyze the Heartless' weaknesses, while Sora uses his Keyblade to directly combat them.
One idea could be that Sora finds himself in a new world where he is surrounded by characters from different Kingdom Hearts realms who all have a strong attraction to him. They compete in a friendly way to go on adventures with him.
Well, a great plot for a Kingdom Hearts 3 Aftermath fanfiction could involve the relationships between the different characters. Like, how Riku and Kairi's friendship might have evolved. Also, since Xehanort was defeated, there could be a power vacuum. Some villains might try to take advantage of it, and the heroes have to stop them before a new, greater evil rises. It could also show the daily lives of the characters in a more peaceful time, with little hints of the past adventures.