Some fanfictions might play with the idea of alternate universes. In an alternate universe, the rules of ninjutsu are different. Naruto could be born with a combination of Uzumaki and Uchiha bloodlines, which would make it possible for him to use Susanoo. Or perhaps he is given this power by a powerful entity in the fanfiction for the purpose of fighting a greater evil that no one else can defeat.
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.
In some fanfictions, Naruto might use Susanoo through some sort of power - sharing or fusion. For example, if there is a plot device that allows him to access the power of the Uchiha, he could potentially use Susanoo. Maybe a powerful enemy forces him to find new ways to power up and he somehow taps into this ability.
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.
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.
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.
Yes, he can. Fanfiction allows for a lot of creative liberties. Writers might imagine a scenario where Naruto somehow inherits or gains access to the Sharingan and then progresses to unlock Susanoo. For example, through some magical or chakra - related accident that fuses Uchiha genetics or power with Naruto's own. But it's important to note this is purely a fan - created concept and not part of the official Naruto lore.
Another way is to have Naruto fuse his chakra with someone who has the ability to use Susanoo, like Sasuke. They could create a combined form that has the best of both their powers. The story could detail their journey of learning to work together and master this new form.
Yes, in some fanfictions, Naruto is often given a perfect Susanoo. Writers like to experiment with different power combinations and abilities for characters, and giving Naruto the power of a perfect Susanoo is a creative way to make the story more interesting.