One idea could be a fanfic where a new character is a guardian of Naruto's hidden powers. This character secretly protects Naruto from those who might try to steal or misuse his power.
Maybe a 'naruto guardian fanfic' could focus on an animal spirit that becomes Naruto's guardian. It could guide him in his training and help him understand the chakra nature better. For example, it could be a fox - like spirit, but different from the Nine - Tails, with its own unique abilities and knowledge.
One interesting 'guardian naruto fanfic' could be about a powerful guardian spirit that aids Naruto in his battles against tough foes. This guardian might have unique abilities that complement Naruto's own skills, like being able to manipulate time briefly to give Naruto an edge in combat.
A great plot for 'naruto as guardian ninja fanfiction' could be Naruto becoming the guardian of a group of young orphans who have special ninja abilities. These orphans are being targeted by an evil organization that wants to use their powers for bad. Naruto has to protect them, train them, and at the same time, keep their existence a secret from the world. He would have to deal with the emotional trauma of the orphans and help them grow into strong and kind - hearted ninjas.
Maybe a plot where the Guardian of the Mist discovers a long - lost secret technique within the Mist village that has the power to change the balance of power in the ninja world. But there are those who would do anything to stop this discovery from being made public.
One idea could be that your OC is a guardian of a long - lost magical artifact from Fairy Tail's history. They have to protect it from a dark guild that wants to use its power for evil. Maybe they team up with some of the main Fairy Tail characters along the way, like Natsu and Lucy, and there are epic battles to keep the artifact safe.
One idea could be Percy being reluctantly recruited by the Hunt. He has to learn their ways while still holding onto his own identity. Maybe he discovers a new power related to the Hunt that no one expected.
One idea could be to create an alternate universe where Naruto has a different elemental affinity from the start. For example, instead of wind, he has lightning. Another could be a fanfic focused on the relationships between the characters outside of the main plot, like how Sakura and Ino rekindle their friendship in a more in - depth way. Or you could write about Naruto's training journey with a different mentor, say Jiraiya's long - lost brother who has a completely different teaching style.
One idea could be a fanfic where Naruto travels to a different dimension where the Akatsuki are the heroes. Another could be a story about Naruto's kids growing up in a world where there's a new threat that they have to face without their parents' immediate help. And a third idea is a fanfic where Naruto discovers a hidden bloodline within himself that gives him unique powers.
One idea could be to focus on a new character joining the Guardian Games. This character could be from a different background and have unique abilities that change the dynamics of the games. For example, a Guardian who can manipulate time in small ways to gain an edge in the competitions.
One idea could be that the guardian angel has lost its memory and has to figure out its purpose while protecting its human charge. Another could be a story where the guardian angel falls in love with the human it's supposed to protect, which creates a whole set of moral and emotional dilemmas. Or perhaps the guardian angel has to team up with a fallen angel to save the human from a greater evil.
Perhaps a fanfiction where the 12 Guardian Ninja have to face a new, extremely powerful enemy. They must use their unique skills and teamwork to overcome this threat. Each Ninja could have a moment to shine, showing off their special abilities. For example, one might use their water - based jutsu to create a huge tidal wave to stop the enemy's advance, while another uses their speed to deliver a crucial strike.