Perhaps the scarab summons was created by an evil ninja long ago, but Naruto discovers that it has a good side too. He has to fight against the scarab's dark nature while also trying to harness its power for good. This internal struggle within the scarab and Naruto's attempts to control it could be a very engaging plotline. For example, the scarab might have a natural inclination to attack allies, but Naruto has to use his willpower and friendship to change that behavior.
A possible plotline is that the scarab is actually a guardian of a secret ninja art. Naruto has to prove himself worthy to the scarab in order to learn this art. Along the way, he faces many challenges and battles, but with the help of his friends, he manages to earn the scarab's trust and gain the new power.
There could be many interesting fanfictions on Naruto's Scarab Summons. Maybe in one, the scarab summons could have unique powers like being able to dig through any terrain super fast, allowing Naruto to use it for quick escapes or surprise attacks during battles.
They could have the ability to fly at extremely high speeds. This would be useful for quick getaways or surprise attacks.
There could be a fanfiction where the Scarab has a connection to an ancient clan in the Naruto world. Maybe it holds secrets about a special jutsu or power that the main characters are trying to uncover. The story could involve Naruto and his friends going on a quest to understand the Scarab's significance and use it to their advantage in the fight against evil.
Maybe the Rider is summoned by Child Emyia to help in a battle tournament. As they compete, they learn more about each other's strengths and weaknesses and form a strong bond. Along the way, they face opponents with various powers and abilities.
One possible plotline could be a situation where Naruto is split into two versions of himself, maybe by some sort of jutsu gone wrong. And as they get to know each other better, they end up kissing as a way to reunite or merge back into one. Another could be in a dream sequence where Naruto is exploring his self - worth and in this dream, he kisses his own reflection which then turns into another version of himself.
Well, a possible plotline might involve Naruto being possessed by the essence of the Shredder. As a result, he starts to act more like the Shredder in his own world. He could form his own group of followers similar to the Foot Clan and try to take over the ninja villages. His friends would then have to find a way to break the possession and bring back the old Naruto. Or, perhaps Naruto willingly takes on the Shredder role to gain new powers to fight a greater evil in his world, but he has to struggle with the darker aspects of the Shredder's personality.
One possible plotline could be that Naruto discovers he is a prince from a hidden or lost kingdom. This could lead to him having to learn royal etiquette while still trying to maintain his ninja ways. Another plotline might be that his status as a prince makes him a target, and he has to protect his new - found royalty while also protecting the Hidden Leaf Village.
One possible plotline could be Naruto having to adapt to his new - found disability. He might struggle with his self - worth as a ninja, since being crippled could limit his physical abilities. He could then focus on developing other skills, like his strategic thinking or his ability to train others.
One possible plotline could be that Naruto is constantly rejected by the village he is trying to protect. This betrayal and lack of acceptance could gradually turn him dark. For example, if the villagers start to blame him for every bad thing that happens, even when it's not his fault. Another plotline might involve Naruto losing someone very close to him, like Sasuke, in a way that he blames the shinobi world for. This could lead to him deciding to take revenge on the world and turn to darker methods of achieving his goals. Maybe he starts to use forbidden jutsu without hesitation, seeing it as a means to an end.
A possible plotline could be that Calypso, with her alluring powers, tries to tempt Naruto away from his path of becoming Hokage. But Naruto, with his strong will, resists and instead tries to show Calypso the importance of having a noble goal. Another plotline might be that Naruto and Calypso team up to fight a powerful entity that is causing chaos in both their worlds.