Well, perhaps the OC is in a life - threatening situation like being trapped in a collapsing cave during a battle. Naruto, being the hero he is, uses his shadow clone jutsu to search for and rescue the OC. Or maybe the OC is being mind - controlled by an enemy, and Naruto has to find a way to break the control and save the OC. It could involve a lot of action and some emotional moments as Naruto tries to reach the OC's true self.
In some 'naruto saves oc fanfiction', the OC might be a key to stopping a great evil. But the OC is too weak to protect themselves. Naruto discovers this and decides to protect the OC at all costs. He might take the OC on a journey to train them and keep them safe from the villains who are after them. This can lead to character development for both Naruto and the OC as they face challenges together.
One interesting plotline could be Naruto having to team up with unexpected allies from different villages to save the world. Maybe he has to work with some of the old villains who have a change of heart due to a greater threat.
The OC could be a wandering ninja who stumbles upon the situation where Kushina is in danger. Maybe they are initially just passing through, but their sense of justice compels them to step in and save her. Then, they might get involved in the larger Naruto world events as a result of this encounter. They could also form a bond with Kushina, which could lead to different relationships with other characters like Minato or Naruto in the future.
Perhaps the OC was banished due to a misunderstanding related to a powerful and dangerous jutsu they were developing. The story could then follow the OC as they try to perfect this jutsu in exile, while also dealing with the threats that come with it. They might be hunted by various groups who fear the power of the jutsu. At the same time, they could have flashbacks to their time in the village, and their relationships with the other characters, which could add depth to their character development.
One common plotline is Naruto arriving just in time to prevent Jiraiya from being fatally injured by Pain. He could use his newfound powers, like Sage Mode or even some advanced Rasengan variations. Another plotline might involve Naruto using his connection with the Nine - Tails to somehow sense Jiraiya's distress across great distances and rush to his aid. In some fanfictions, Naruto might also enlist the help of his friends like Kakashi or Sakura to form a rescue team for Jiraiya.
One interesting plotline could be Snape's internal struggle as he tries to save the Potters. He has complex feelings towards James Potter, yet his love for Lily drives him to protect the family. Maybe he has to outwit Voldemort's inner circle without revealing his true intentions.
One interesting plotline could be Hermione using her vast knowledge of magic to outwit a powerful dark wizard who has everyone else under a spell. She might find a long - forgotten spell in the library that can reverse the dark magic.
Perhaps Merlin has to save the knights from a curse. He could go on a long journey to find the ingredients for an antidote while facing many obstacles along the way. He might have to outwit evil spirits or solve difficult riddles to get what he needs to break the curse on the knights.
Another interesting plotline could be related to the prophecy or some sort of hidden danger that only Shanks is aware of. He saves Luffy not just from an immediate threat but from a long - term danger that could have ended Luffy's journey towards becoming the Pirate King. Shanks might have to sacrifice something of his own in the process, like his position or a precious item, to ensure Luffy's safety.
One possible plotline could be Damon using his vampire abilities in a unique way to rescue Bella from a dangerous situation, like a group of rogue vampires. Maybe he uses his speed and strength to fight them off.
A possible plotline could be that Tayuya is captured by an evil organization, and Naruto goes on a solo mission to save her. He uses his stealth skills to infiltrate the enemy base.