Another plot could be a time - travel fanfiction where the Band of Seven is sent to the past or future. In the past, they could interact with younger versions of characters, and in the future, they could see the consequences of their actions.
One idea could be exploring the backstories of each member of the Band of Seven in more detail. For example, how they came together and what their individual motives were before joining the group.
Maybe the boy band is formed as a way to promote peace between the different ninja villages. Each member from a different village, like Sasuke from Konoha, Gaara from Suna, etc. They travel around performing and sharing their stories of how they overcame differences, which helps in building better relations among the villages.
One idea could be that Naruto and Hinata form a band together with their friends. They start off small, playing at local events in Konoha. As they gain popularity, they face challenges like rival bands trying to undermine them. Another plot could involve Hinata writing lyrics inspired by her feelings for Naruto, which adds a deeper emotional aspect to their music.
Perhaps Naruto discovers a hidden power within himself that allows him to perform all the functions of a team alone. He uses this power to take on a powerful enemy single - handedly and prove his worth. For example, he might be able to create clones that can perform different types of jutsu simultaneously, like one clone for taijutsu, one for ninjutsu and one for genjutsu.
One idea could be a new recruit trying to earn a place among the Seven Ninja Swordsmen. They could face various challenges like mastering a unique sword technique that was once used by a former member.
One idea could be the seven deadly weapons being tied to ancient ninja clans in the Naruto world. For example, a weapon might be hidden within a clan's secret temple and its discovery could start a race among different ninja groups. Another could be that the weapons are cursed and whoever wields them starts to be influenced by the deadly sin associated with each weapon, like the sword of wrath causing the wielder to have uncontrollable anger.
One idea could be to have Naruto characters embody the seven mortal sins in unique ways. For example, Naruto might struggle with gluttony in the sense of his insatiable desire for ramen, but it could be a metaphor for his larger appetite for life and friendship. Another could be to explore how Sasuke might represent pride, with his unwavering belief in his own abilities and his need to prove himself above all others. And Hinata could represent envy in her early days, envying the confidence and strength of others while she was so shy.
One idea could be a story where a new character discovers the Seven Star Sword and has to learn how to control its power without being consumed by it. Maybe they face challenges from both villains who want the sword for evil purposes and the ninja villages who fear its power.
Maybe an OC who is a sniper. The plot could revolve around their training, how they hone their skills, and the intense pressure they face during missions. They might have a personal vendetta against a particular enemy sniper, leading to a tense cat - and - mouse game throughout the story.
Another plot could involve fem Naruto being accused of the sin of envy. In the Seven Deadly Sins' setting, she could envy the powers or status of certain characters. She might see how powerful Meliodas is, for instance, and envy his leadership and strength, which could lead to her making some unwise decisions in an attempt to prove herself equal or better.
A plot could revolve around a time - travel fanfiction. Maybe a character goes back in time and has to prevent an event that would have a catastrophic effect on the future of the Trinity Seven world. This could involve interacting with younger versions of the characters and changing their fates.