One interesting concept could be exploring how different characters might unlock or master the inner gates in unique ways. For example, a fanfiction might show a side character who discovers a new method of opening the gates that no one else has thought of before.
One popular plot device is the discovery of new levels or abilities within the 8 Inner Gates. For example, a character might find a way to unlock a ninth gate that no one knew existed. Another is the idea of a character using the gates in a non - traditional way, like using the power of the gates to heal instead of just for combat. Also, the concept of a character having a special connection to the gates, perhaps due to a rare bloodline or a prophecy, is often used.
One idea could be exploring what would happen if a new character mastered the Eight Inner Gates in a unique way. For example, instead of using it just for combat, they use it to enhance their medical ninjutsu, being able to heal more quickly or even perform impossible surgeries by supercharging their chakra control with the gates. Another idea is a time - travel fanfic where a character from the future comes back to train the early Naruto characters in the proper use of the Eight Inner Gates, changing the course of many battles.
Another plotline might involve Naruto opening the inner gates during a crucial battle where he is severely outmatched. His use of this extreme power could turn the tide of the battle and also earn him new respect from his enemies. He could also face the consequences of using such a powerful and dangerous technique, like dealing with the extreme physical strain it causes in new and unexpected ways.
One interesting fanfiction could be 'The Unleashing of the 8 Inner Gates'. In this story, the main character, perhaps a new ninja in the Naruto universe, discovers a unique way to control the 8 Inner Gates that no one has ever thought of before. It could involve a lot of intense training scenes and battles where the power of the gates is pushed to the limit. Another great one might be 'Beyond the 8 Inner Gates', which could explore what lies beyond the known limits of these powerful gates, like a new form of chakra or a secret jutsu.
Rock Lee is also very popular. Since he is known for his focus on physical combat and his ability to use the inner gates in the original series, many fanfictions center around him. Writers might explore his further training with the gates or his interactions with other characters while using them.
If Deku had a quirk in fanfiction, it would likely impact his character development. He might have become more powerful quicker or taken on different enemies. The story could become much more action-packed or focus on different themes.
Obviously Naruto himself, as the title implies he is the one opening the inner gates. Rock Lee could also be involved as he is well - known for his use of the inner gate techniques in the original series. He could either be a mentor to Naruto or compete with him to see who can master the gates better.
It could make for a really exciting and unique story. Deku's growth and challenges would be measured in a more structured way, adding a new layer of excitement to his journey.
Focus on unique character development. Instead of just having the main characters, introduce new and interesting side characters related to the Eight Inner Gates. For example, a hermit who has been secretly studying the gates for years. Also, add some unexpected plot twists. Maybe the gates don't work as expected in a certain situation, or there's a hidden connection between the gates and an ancient prophecy.