Another plot line could be that Naruto discovers a new form of chakra that is related to being a fighter. This new power source could attract the attention of powerful and malicious forces. He then has to fight to protect this new power and also figure out how to master it without it consuming him.
One idea could be a tournament where characters from different villages and generations compete. For example, Naruto's son could face off against Sasuke's daughter. Another could be a team - based arena fight where the teams have to strategize and use unique jutsus to win. Maybe a fight in an ancient, forgotten arena filled with dangerous traps that the fighters have to avoid while battling each other.
One idea could be a tournament where Naruto characters use their fist - fighting skills. For example, Naruto could face off against Sasuke in a no - jutsu, just pure fist - fighting battle. It would be intense as they both have their own unique fighting styles. Naruto's more energetic and improvisational style against Sasuke's calculated and precise strikes.
One idea could be that Naruto characters are transported to the Street Fighter universe and have to learn the fighting styles there. For example, Naruto might be intrigued by Ryu's Hadoken and try to incorporate it into his own Rasengan. Another could be a tournament where both Naruto and Street Fighter characters compete. Sakura could face off against Chun - Li, with Sakura using her medical ninjutsu in unique ways during the fight.
One interesting plot line could be Ibiki teaching Naruto advanced interrogation techniques. Naruto might initially struggle but then start to pick up on Ibiki's skills and use them in unique ways during battles or when dealing with enemies. For example, he could use the psychological aspects of interrogation to outwit opponents on the battlefield.
One possible plot could be that Naruto, through some sort of interdimensional rift, ends up in the Street Fighter universe. There, he meets the female characters like Chun - Li, Cammy, etc. They initially see him as an oddity but gradually become attracted to his tenacity and unique ninja skills. Naruto, in turn, is both bewildered and intrigued by these new and powerful women, and they form a sort of harem around him as they go on adventures together, fighting common enemies and learning from each other's fighting styles.
In the Fighter of Destiny light novel, there is a plot line about an ancient prophecy. The main character might be the key to fulfilling it or preventing a great disaster, which leads to a lot of exciting adventures as he tries to figure out his role in it all. There are also sub - plots about his relationships with other characters, some of whom might be allies, while others could be secretly plotting against him.
One idea could be a crossover tournament where Naruto characters like Naruto, Sasuke, and Sakura enter the Street Fighter universe to compete. They could learn new fighting styles from the Street Fighter characters and form unique friendships or rivalries.
Perhaps a plotline where the line between good and evil blurs. A character, who was once considered an ally, starts to use brutal fighting methods for what they think is the greater good. This causes a rift among the ninja community, and Naruto has to decide whether to stop this person or understand their motives.
One possible plot line could be Naruto, Sasuke and Sakura getting involved in a time - traveling adventure. They might end up in a different era in the Naruto world, having to adapt to new rules and challenges while also trying to find their way back home.
Often, there is a plot of the main character having some insecurities. After being adopted by BTS, the members gradually help the character overcome these insecurities through their love and positive influence. There might be moments of conflict too, like when the public or the media reacts to the new addition to BTS's 'family'. But in the end, it usually results in a stronger bond between the main character and BTS.