One idea could be that Yuma and Dark Mist are from different realms and they accidentally meet. They initially have a misunderstanding but as they get to know each other, they find they have a common goal of protecting a certain magical artifact. Another could be that Dark Mist is being hunted and Yuma offers protection in exchange for knowledge about a mysterious power.
Well, perhaps Yuma discovers that Dark Mist has a hidden side that is not as menacing as it seems. They could start to form an alliance when they both face a greater evil. For example, a powerful sorcerer is trying to take over their world and they need to combine their unique abilities. Dark Mist's shadowy powers and Yuma's special skills could be used in creative ways to defeat the sorcerer.
A plot could be where Dark Mist has a premonition about a future danger to Yuma. He tries to warn Yuma, but Yuma is initially skeptical. As events unfold, Yuma realizes that Dark Mist was right all along and they must team up to prevent the disaster. This could involve battles against new and powerful foes.
The main characters are Yuma and Dark Mist. Yuma is likely to have certain unique abilities or characteristics that make them an interesting protagonist. Dark Mist, on the other hand, probably has an air of mystery about it, with powers that are either dark - in the sense of being related to shadows or the unknown - or powers that are misunderstood as being dark.
Well, a plot might involve Dark Spyro and Dark Cynder trying to find a way to break free from an ancient curse that binds them to their dark forms. They could travel to different realms in search of a cure. Also, perhaps they start to question their dark nature when they encounter a group of innocent creatures and have to decide whether to harm them or not. Maybe they get involved in a power struggle within the dark side, with other dark entities vying for control over them.
One possible fanfiction could be about Yuma and Dark Mist forming an unexpected alliance. Maybe Dark Mist has some hidden motives that initially seem malicious but as the story progresses, it turns out he's actually trying to protect Yuma from a greater evil in the Zexal world.
In 'naruto assassin of the mist fanfiction', a great plot idea could be that the assassin is actually a part of a secret organization within the Mist Village. This organization has its own motives and plans that are against the will of the village. Naruto, being the hero he is, stumbles upon this and tries to stop the assassin from fulfilling the organization's evil deeds. Along the way, the assassin might start to question their loyalty to the organization as they get to know Naruto better.
Maybe a plot where the Guardian of the Mist discovers a long - lost secret technique within the Mist village that has the power to change the balance of power in the ninja world. But there are those who would do anything to stop this discovery from being made public.
A great plot could be a 'what if' scenario. What if the main character made a different choice at a crucial moment? Like if Feyre didn't go with Rhysand at a certain point. This could lead to a completely different set of events and relationships in the fanfiction.
One interesting plot could be that 'dark kushina' initially tries to manipulate Naruto for her own goals but gradually develops real feelings for him as she gets to know him better. Another could be that they are forced to work together to save the Hidden Leaf Village from a powerful enemy.
Maybe a plot where Dark Percy has some sort of power that Thalia needs to save someone she loves. Thalia has to convince Percy to use his powers for good in this case, and in the process, they develop a complex relationship. Percy is conflicted between his dark side and the pull he feels towards Thalia's cause.
One idea could be that Dark Sonic and Blaze are from different dimensions but are brought together by a powerful villain. They have to put aside their differences and work together to defeat the villain. In the process, they start to understand each other's powers and motives.