Sasuke is often a very popular character in such fanfictions. Since he is one of the main users of the Susanoo in the original series, many fanfictions explore more of his adventures with the complete form. Naruto can also be popular as he might interact with Sasuke's complete Susanoo in unique ways.
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.
A popular plot twist could be that the Fem Susanoo is actually an ancient being reincarnated, and Naruto is the key to her remembering her past life. This changes their relationship from just an odd pairing to something deeply connected to the history of the ninja world.
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.
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.
Sure. There could be fanfics with this concept. Naruto is known for his own powerful abilities like the Rasengan and Sage Mode. But in the world of fanfiction, writers can bend the rules. Maybe in a story, Naruto gets the Susanoo as a result of a powerful curse or a gift from an ancient being. It would be really cool to see how he would use it in combination with his existing skills.
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.
She could try to appeal to Sasuke's emotions. If she can remind him of their past, of the times they fought together and cared for each other, it might make him release her. Sakura could talk about their shared experiences and how they are on the same side deep down, hoping to break through whatever is making Sasuke hold her captive.