A unique plot could involve a mix of the two worlds' magic systems. For instance, combine the Kuroinu's dark magic with Naruto's ninjutsu. The characters could learn from each other. Say, a Naruto character learns a dark magic spell and has to control its corrupting influence while using it for good.
Mix the power systems. Let characters combine their ninjutsu with Honkai powers in unexpected ways. For example, a character could use a water jutsu along with the Herrscher of Ice's powers to create super - powerful ice attacks.
You can make it unique by introducing a new character who is the catalyst for the yandere harem. For instance, a foreign princess with yandere tendencies visits Konoha and immediately falls for Naruto. Her presence makes the existing female characters in Naruto's life feel threatened, and they also become more yandere - like in response.
A simple way is by having the hired criminal's true identity be someone unexpected. Maybe it's a long - lost relative of a main character. This would completely change the dynamic of the story.
You could start with the idea that the Monopoly game is a training exercise created by a powerful ninja. The players have to not only win the game but also learn valuable ninja skills along the way. For example, if they pass 'Go', they gain a new jutsu instead of just getting money.
You can start by focusing on a side character from the original series and build their story in the future. For instance, Rock Lee's son could struggle with not having the same natural talent as his father but overcomes it through sheer determination and a new form of taijutsu training.
Combine the ninja clans in Naruto with the Sith hierarchy. For instance, make a particular clan have a secret connection to the Sith. This could lead to internal power struggles within the clan as some members are tempted by the Sith ways. The main character, like Naruto, could be caught in the middle, trying to save his friends from this new dark influence.
You can combine the aesthetics of the Badlands with Naruto - style ninja elements. For example, a character could be a nomadic archer who also has some basic wind - style jutsu, inspired by Naruto's own wind - style attacks.
A unique plot for a 'lemon pokemon fanfic' could be based on a time - travel element. A trainer accidentally travels back in time to a period when lemon - related Pokémon were first discovered. They have to figure out how to get back to their own time while also ensuring that the history of these Pokémon is not altered. Along the way, they form bonds with the ancient Pokémon trainers and learn about the origin of lemon - based Pokémon powers.
You can start with a conflict. For example, a group of evil creatures wants to destroy all the bubbles because they are afraid of their power. The bats, being the protectors, have to fight back. This creates an action - packed plot.
You could start with a plot where the Saiyan race is somehow connected to an ancient shinobi clan in the Naruto world. A young Saiyan - Naruto hybrid discovers this connection and is then drawn into a conflict that requires the help of the Avengers. Maybe there's a powerful enemy that wants to use the combined power of Saiyan and ninja abilities for evil, and the heroes must stop it.