One possible interesting plot could be Obito revealing his true identity to the Akatsuki members. It would create a huge shock and change the dynamics within the group.
The appeal lies in the contrast of their characters. Naruto is the energetic and optimistic hero, Temari is the strong - willed and somewhat abrasive kunoichi, and Obito has a tragic and complex past. When combined in fanfiction, these differences can create engaging story arcs.
I recommend Naruto: While Naruto is still young, I tricked him into becoming my underling. The protagonist, Zhang Yuanqing, became a small villager named Yuanmu in the Naruto World. He obtained the god-level selection system and chose to trick Naruto into becoming his underling. He then led him to defeat the Akatsuki organization and unify the Ninja World. Although it wasn't completely similar to Xiao, it was still an existence similar to a faction. I hope you like this fairy's recommendation. Muah ~😗
Naruto could be one of his allies. Naruto has this knack for seeing the good in people and would probably be willing to give Obito a chance to redeem himself. Also, Sakura, with her skills as a medic - ninja, could be an ally. She might help heal Obito if he was injured during the war and see the potential in him to be a force for good.
There could also be interactions with the new generation of ninjas. They might view Obito as a sort of legend or a cautionary tale. Their fresh perspectives could either inspire Obito to change further or make him feel even more out of place in this new post - war ninja world.
Well, the reborn character could explore Obito's Sharingan powers in new ways. Instead of using them mainly for combat like Obito did in the original story, they could focus on using the Sharingan to understand the emotions of others. For example, they could use it to detect lies and hidden motives, which would be a unique twist on the power.
Besides Obito, Sasuke could be a main character in this fanfiction. Sasuke, with his own journey of redemption and his understanding of power and the ninja world, could have an interesting dynamic with the reincarnated Obito. Also, Sakura might play a role. She could be the one who tries to heal the reincarnated Obito, both physically if he is injured during his new adventures and emotionally from the traumas of his past life.
Often, Obito is attracted to Kushina's strength and kindness. He might try to impress her with his own abilities. Their interactions could involve Obito being a bit clumsy in his attempts at first. Kushina, on the other hand, might find his eagerness endearing and start to open up to him more. They could share stories about their pasts, their dreams, which deepens their bond.