One interesting storyline could be the twin having a unique ninja ability that Naruto doesn't have. For example, the twin might be able to control water in a way that no one else in the village can. This could lead to them being trained by a different master, perhaps someone who specializes in water jutsu. Another storyline could be the twin getting involved in a different prophecy than Naruto. Instead of being the one to save the village from a certain threat like Naruto, the twin could be fated to deal with an internal conflict within the ninja clans. And finally, the twin could have a different relationship with Sasuke. Maybe they are friends from the start and their friendship has an impact on how Naruto and Sasuke's relationship develops over time.
In this type of fanfiction, one possible storyline is that the twin is initially mistaken for Naruto in a dangerous situation. This leads to the twin being targeted by the wrong people, but also gives them the chance to prove themselves as a strong ninja in their own right. Another interesting plot could be that the twin has a special bond with a mythical creature, like a phoenix or a dragon. This bond helps them in battles and also makes them an object of envy and suspicion among other ninjas. Also, the twin could have a role in uniting different ninja villages through their diplomatic skills, which is different from Naruto's more combat - oriented role in the series.
Well, in some 'naruto has a twin oc fanfiction', a great storyline is when the twin has a secret connection to an ancient ninja clan that was thought to be extinct. This connection could bring in new elements of ninja art and history. Also, the twin might be kidnapped at a young age by an enemy village, and Naruto has to go on a rescue mission, which would be full of action and adventure. Another aspect could be that the twin has a different view on the concept of chakra, and tries to develop a new way of using it, which causes both excitement and controversy among the ninja community.
One interesting storyline could be about Naruto and his siblings training together secretly. They might discover new jutsus that are unique to their family line. This would not only strengthen their bond but also make them a formidable force in the ninja world.
One interesting storyline could be the daughter inheriting Naruto's determination. For example, she might strive to become a great ninja like her father in a time of peace. She could face unique challenges, like dealing with the high expectations set by Naruto's legacy.
Well, Naruto and his twin oc are the central figures. But don't forget about the other Konoha ninjas. Shikamaru, for example, could befriend the twin and use his intelligence to help the twin in various situations. Hinata might also have a role, perhaps having a crush on the twin instead of Naruto this time. And of course, the Hokage, whether it's Tsunade or someone else, would be involved in governing the village and dealing with any issues that the twin or Naruto might cause.
In this fanfiction, the hidden blade could be a cursed object that Naruto initially doesn't realize. As he starts using it, strange things begin to happen. He might start having visions or losing control of his chakra at times. However, with the help of his friends like Sasuke and Sakura, he tries to figure out the origin of the blade and how to break the curse. They might research in old ninja scrolls or consult with wise elders in the village to find a solution.
Another storyline might involve Naruto's family expanding. They could adopt orphans from the war-torn areas of the ninja world. This would show their big - heartedness and also bring new dynamics to the family as they integrate these new members.
In some persona 4 oc fanfiction, an OC might be a detective who is secretly investigating the strange happenings in Inaba. This OC could have their own set of skills and resources, and as they dig deeper, they discover connections between the real world and the TV world that the main characters haven't noticed yet. Their investigations could also put them in danger and lead to some intense action scenes.
Another could be an OC with the Omnitrix getting stuck in a parallel universe where the rules of the Omnitrix are different. For example, instead of being able to transform into known aliens, the OC has to figure out how to use new and strange alien forms that are native to that universe. This could lead to all sorts of adventures as the OC tries to find a way back home.
Another could be a love story within the context of the royals. An original character might fall in love with a royal heir. There could be many obstacles such as differences in social status and the expectations of the royal family. But their love overcomes all these difficulties in the end.
One interesting storyline could be about an original character (OC) who is a half - elf with unique magic abilities trying to find their place in the war - torn world of Warcraft. They might struggle between the two sides of their heritage.
A really engaging storyline might be the OC having to train a young rookie. They take this newbie under their wing, but the rookie has some bad habits that the OC has to break. It's a story of mentorship, growth, and the clash of different generations in the WWE world.