There might be a fanfiction where a dragon egg is discovered by the Sannin. They each have different ideas on what to do with it. Jiraiya wants to protect it and see what kind of power it might hold when it hatches. Tsunade is a bit more cautious, worried about the potential danger. Orochimaru, of course, is only interested in using it for his own gain. The story could revolve around their conflicts and decisions regarding the dragon egg.
Some Naruto OC Sannin fanfictions focus on the OC being a new student of the Sannin. The OC could be from a small village and have a natural talent that the Sannin recognize. The fanfiction might explore how the OC adapts to the intense training of the Sannin, the relationships they build with other Naruto characters, and how they grow in power and wisdom as they learn from these legendary ninja.
One interesting fanfiction could be about the Sannin's early days together. It might explore how Orochimaru, Jiraiya and Tsunade first formed their bond and learned their unique skills. For example, it could show their training under Hiruzen Sarutobi in more detail.
One interesting Naruto Phoenix Sannin fanfiction could be about their adventures in a new land not shown in the original series. They might encounter unique creatures and have to use their combined skills in different ways.
One plot idea could be that the Sannin discover a prophecy that only Naruto, Sasuke, and Sakura can fulfill. So they take the three under their wings more intensively. Jiraiya focuses on Naruto's spiritual growth, Orochimaru on Sasuke's control over his dark powers, and Tsunade on Sakura's physical and mental strength. As they train, they also uncover secrets about the ninja world that could change everything.
There might be a 'Naruto' fanfiction where the concept of gallons is used in a more metaphorical sense. For example, gallons could represent the amount of love or friendship Naruto has for his comrades. Maybe a story where Naruto's actions are described as filling gallons of hope in the hearts of the villagers. It could also be a fanfiction where a character has the ability to measure the 'gallons' of a person's chakra reserve in a more precise way than normal, leading to new training methods for Naruto and others.
One interesting 'Naruto' fanfiction with glasses could be one where a character who doesn't usually wear glasses in the original series suddenly has to. For example, Naruto might find a pair of magical glasses that give him the ability to see chakra in a new way. It could add a whole new layer to his adventures and battles.
One of the best is 'Naruto's Sannin Adventure'. In this, Naruto embarks on a journey with the Sannin, and each stop on the journey teaches him something new about ninja life, power, and friendship. The author does a great job of portraying the relationships between Naruto and the Sannin. There's also 'The Sannin and Naruto's Destiny' which explores how the Sannin are intertwined with Naruto's destiny. It has a complex plot that keeps you hooked from start to finish.
One unique aspect is the different power - up Naruto gets. Instead of following the normal path in the original series, he gains skills directly from the Sannin. This often makes him much more powerful in a different way.
One interesting Naruto fanfiction with the Glass Bloodline could be about a character who discovers this unique bloodline ability late in their ninja training. This discovery could lead to a whole new set of challenges and adventures as they try to master it while also facing the normal perils of the ninja world. For example, they might have to deal with other ninja clans who are either jealous or afraid of this new power.
One interesting Naruto fanfiction with a black sword could be about a new character who wields the black sword and has a mysterious origin. This character might enter the Naruto universe and cause a stir among the existing ninja clans. They could be on a quest related to the sword's power, and the story could involve battles with Naruto and his friends as they try to figure out if this new person is a friend or foe.