There's a fanfic I read once called 'Beyond the 8 Gates in Naruto's World'. It was really cool. It showed how the concept of the 8 Gates could be expanded upon. Instead of just being a physical power-up, it was tied to spiritual and mental growth as well. The main character had to face many challenges related to the 8 Gates and in the process, became a much stronger and wiser ninja.
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.
One great 'Naruto Kabutowari fanfic' is 'The Power of Kabutowari' which explores the unique abilities of the weapon in-depth. It shows how Naruto might master it in different ways compared to traditional jutsu training.
One great fanfic could be 'The Mysterious Fox Mask'. It delves into the origin of the fox mask in Naruto's world. It might show how the mask was created and what powers it could potentially hold. It could also explore the relationship between Naruto and the mask, like if it has a spirit of its own that Naruto has to bond with.
One interesting fanfic could be where Kakashi uses his Sharingan in a unique way to train Naruto. Maybe he shows Naruto how to better analyze his opponents' moves just by using the Sharingan's ability to copy and predict. For example, Kakashi could create a special training ground where Naruto has to face multiple clones of himself that mimic the fighting styles of different enemies. And the Sharingan plays a crucial role in Naruto understanding the patterns of these clones.
Well, I remember a fanfic that focused on a side character getting the absorption jutsu. It was titled 'Sideways with Absorption'. The story details how this character, who was previously overlooked, suddenly becomes a key player in the village's defense with the help of this powerful jutsu. It also delves into the character's relationships with other Naruto characters and how they react to this newfound power.
A fanfic that stands out in the Naruto chakra manipulation genre is 'Naruto's Chakra Revolution'. In this story, Naruto is faced with a new threat that can only be defeated by revolutionizing his chakra manipulation skills. He experiments with combining different natures of chakra in ways that were previously thought impossible. The author does a great job of explaining the mechanics of chakra manipulation, which makes it both educational and entertaining for Naruto fans.
In some fanfics, the 7 Swordsmen Swords are used in a different era than the original Naruto storyline. For example, in a future time where new threats have emerged. The fanfic might explore how the swords, with their old and powerful magic, are still relevant in this new setting. It could show new techniques being developed for using the swords against modern - day enemies.
I'm not sure about a specific fanfic just on Naruto's oxygen mask. But you could try looking on fanfiction.net or Archive of Our Own. They have a vast collection of Naruto fanfics, and you might be able to find one that involves an oxygen mask in some interesting plot.
One possible fanfic could be 'The Bonds of Mothers'. It might explore how their mothers' influence could have shaped Naruto and Bakugo in different ways. It could show Naruto's mother's love and sacrifice and how Bakugo's mother might have dealt with his strong - willed nature.
There's a fanfic where Danzo tries to manipulate Naruto for his own political gain. However, Naruto, being the perceptive character he is, quickly catches on. This leads to a battle of wits between them. In the end, Naruto uses his own brand of talk - no - jutsu to make Danzo see the error of his ways and they end up working together to reform the village's political system.