One common theme is redemption. Naruto often uses rinne tensei to bring back characters who have made mistakes in the past and gives them a chance at redemption. Another theme is sacrifice, as using rinne tensei usually comes at a great cost in these fanfics.
There's a fanfic called 'Naruto's Rinne Tensei Adventure'. Here, Naruto uses rinne tensei to save the village in a time of great peril. The story is full of action and also delves into the moral implications of using such a powerful jutsu. It's a great read if you like Naruto fanfics with a bit of depth.
Naruto himself is often a very popular character in 'naruto rinne tensei fanfiction'. Since he's the main character of the original series, fans like to explore how he would be further developed with the rinne tensei powers. Sasuke is also popular as his relationship with Naruto can be further explored in new ways with this power involved.
Well, in 'naruto rinne tensei fanfiction', the idea of alternate universes where rinne tensei has different rules is really cool. It allows for a lot of creativity. Also, the relationships between characters can be re - imagined. For instance, a character who was an enemy in the original might become an ally because of the rinne tensei and the new circumstances it creates.
He could revive Minato. Minato was a very powerful ninja, and his return could help Naruto in terms of combat skills and strategic thinking. Also, Minato could pass on some unique jutsus or knowledge that he didn't have a chance to before.
In the fanfic, Naruto might use Edo Tensei to resurrect Orochimaru in a controlled way. Since Orochimaru has extensive knowledge of jutsus and the ninja world, Naruto could use him to gain insights into some ancient and powerful techniques. This would create an interesting dynamic as Naruto has to keep Orochimaru in check while also using his knowledge for the greater good.
He could develop a sense of self - doubt. Maybe the process of using Chibaku Tensei makes him question if he's becoming too powerful and if he's still the same Naruto. He might worry that his friends will start to see him differently, as someone who wields such a terrifying ability. This could lead to some internal struggles within his character as he tries to balance his new power with his old self.
It could be a rogue ninja who has also obtained a corrupted form of the Rinne Sharingan. This antagonist would use the power for his own gain, causing chaos in the Naruto world. He might be seeking to overthrow all the existing shinobi villages and establish his own rule, using the unique abilities of the Rinne Sharingan like the ability to create powerful illusions that can affect entire villages at once.
There would be chaos. The Edo Tensei brings back the dead, and in Fairy Tail, it would disrupt the natural order. Maybe the revived characters would cause trouble or be used as powerful weapons.
Another plot could revolve around a character who accidentally acquires the Rinne Sharingan and has to learn to control it while being hunted by various groups. Some might want to use the power for their own evil purposes, while others fear the unknown capabilities. This character could start as a relatively weak ninja but gradually become stronger as they master the Rinne Sharingan, forming alliances with unexpected characters along the way.