How about a villain oc who is a time - traveler? They come from a future where the Naruto world has been destroyed, and they believe that by changing the past in a certain way, they can prevent the destruction. But their methods are extreme and involve killing off key characters. Or a villain oc who is an artist at heart but uses their art to create deadly traps and illusions. They see the world as their canvas and the people in it as mere subjects for their 'art'.
A villain oc who is a half - human, half - beast hybrid. They were outcast from society because of their appearance and now seek revenge on all the villages. They have unique physical abilities due to their hybrid nature, like super strength and enhanced senses. Or perhaps a villain oc who is a former student of a great ninja but turned against their teachings. They create their own new and dangerous form of ninjutsu that goes against the traditional ways.
One idea could be to explore the backstory of Orochimaru in more depth. Maybe show his early days in the Hidden Leaf Village and what led him to become so obsessed with immortality and dark jutsu.
Perhaps an OC that is a foreign ninja from a far - off land with a completely different fighting style based on music. They use sound waves to attack, defend, and even hypnotize opponents, much like how Jiraiya uses his toad - related jutsu in creative ways.
One idea could be to create a male oc who is from a small, hidden village that has a unique jutsu passed down through generations. He could come to Konoha to learn more about different ninja techniques and end up forming a team with some of the original Naruto characters. His backstory could involve a family secret related to the village's past.
An interesting approach for a 'Naruto Reborn OC Fanfic' would be to create an OC who is an outsider to the ninja world but has to adapt quickly. This OC could be from a far - off land where they have different fighting styles or powers. For instance, a place where they use music as a form of combat, and when they come to the Naruto world, they have to blend in while also introducing their unique skills. They could form unexpected alliances and face challenges that are different from what the native ninja are used to.
One idea could be a villain OC who has the power to manipulate time. They could go back in time to change key events in the Young Justice universe, creating chaos and forcing the heroes to figure out how to reverse the changes. For example, they might prevent the formation of the team in the first place.
You could create a Root OC who has a unique relationship with Danzo. Maybe they are starting to question his extreme methods and are on a journey of self - discovery within the strict and secretive Root. This would add an interesting internal conflict as they have to balance their loyalty to Root and their growing moral compass.
One idea could be to create a villain OC who has the power to manipulate time in small increments. This could lead to really interesting scenarios in battles against the heroes. For example, they could slow down time just enough to dodge attacks and then speed it up suddenly to surprise their opponents.
One idea could be a villain OC who has the power to manipulate dreams. They could enter the ponies' dreams and create nightmares, causing chaos and fear. This villain could be motivated by a desire for power over the dream realm.
A possible plot is that the cat OC is a magical being from a different dimension. It gets lost in the Naruto universe and Naruto helps it. In return, the cat OC teaches Naruto some unique chakra - control techniques that it has from its own world, which gives Naruto an edge in battles.
One idea could be an OC who is a master of a unique water jutsu in Kirigakure. They could be on a mission to uncover a long - lost secret about the village's founding. Another could be an OC who is trying to reform Kirigakure's harsh shinobi training system from within. Maybe an OC with a special bloodline limit that is feared by others in the village at first but then they prove their worth.