A great fanfiction concept might be that Naruto somehow gains the Sharingan and Susanoo abilities. Maybe through some sort of experimental jutsu gone wrong (but in a good way). He then has to learn to control these new powers while still maintaining his own Sage Mode and Nine - Tails chakra. It would be interesting to see how he combines these different power sources to fight against new and old enemies.
Well, a simple fanfiction could be about a young ninja who discovers a secret scroll that unlocks an advanced form of the Sharingan and Susanoo. He then uses these powers to protect his village from a group of rogue ninjas. He quickly becomes a hero in the village but also has to deal with the jealousy of some of the other ninjas who don't have such powerful abilities.
There's a really interesting fanfiction that focuses on a female character getting the Mangekyou Sharingan and Susanoo. It's unique because it delves into how a female ninja copes with the power that is usually associated with male Uchiha characters. It shows her struggles, her triumphs, and how she changes the perception of these powers in the Naruto universe.
There could be a fanfiction where a villain has mastered both the Mangekyou Sharingan and Susanoo in a way that no one has seen before. This forces the heroes to find new ways to combat this powerful foe, perhaps by delving into ancient jutsu that can counteract these abilities. It would be full of intense battles and strategic planning.
The abilities might be different too. Since Naruto has his own set of skills like the Rasengan and Sage Mode, his Susanoo could incorporate those elements. For example, his Susanoo's hands could form giant Rasengan - like attacks, or it could have the ability to enter Sage Mode, which would be a huge departure from the regular Uchiha Susanoo's abilities.
Well, in many fanfictions, Naruto might first awaken Susanoo during a really intense battle. Maybe he's pushed to his limits while fighting a super - strong enemy, and his latent Uchiha blood (if that's part of the fanfic's premise) gets activated, leading to the awakening of Susanoo.
Yes, it is. Fanfiction often bends the rules of the original story. Writers can come up with all kinds of creative explanations to give Naruto the ability to use Susanoo.
One idea could be a story where Naruto somehow gains the ability to use Susanoo. Maybe through some strange chakra experiment gone wrong or a gift from an ancient entity. He then has to learn how to control this new power while still maintaining his own ninja way.
In fanfiction, the Perfect Susanoo is usually much larger and more powerful than the normal Susanoo. It might have additional limbs or weapons that the normal one doesn't have. For example, it could have extra arms to hold more weapons or perform multiple attacks simultaneously.
In fanfiction, Naruto could get the Sharingan through a blood - related connection that is revealed later. For example, it could be discovered that he has some distant Uchiha ancestry that gets activated somehow. Maybe a powerful enemy's attack awakens this dormant Uchiha blood in him, and as a result, he develops the Sharingan. It could also be that a powerful sage or a new character uses their own unique powers to bestow the Sharingan upon Naruto for a specific purpose.