The book,"Becoming Naruto with the katana," meets your requirements. It can satisfy the plot of possessing the Reaper's Soul Slayer and dressing up as Naruto's brother. The title of the book is "Becoming Naruto with the katana," and it is also a doujinshi novel. I believe you will like it. I hope you like this fairy's recommendation. Muah ~š
He could have the ability to perform kido, which are the spells used by Soul Reapers. This would give him a whole new range of offensive and defensive capabilities. He might also be able to use bankai, a super - powerful form of his zanpakuto. His new powers could include enhanced spiritual perception, allowing him to sense things that normal ninjas can't, like the presence of Hollows or spiritual disturbances.
Well, the plot could be that Naruto has the powers of the Grim Reaper. He might be in charge of collecting the souls of the dead in the Naruto world. Maybe he uses his new powers to judge those who have committed great evils during their lives in the shinobi world.
šI recommend the following novels to you: 1. "777x Ability Enhancement from Muye onwards": The main character can copy and enhance various abilities and collide between different worlds, including Naruto, Pirate, Death, etc. 2. Naruto: The Strongest Ninjato: The protagonist comes from the Grim Reaper and possesses the strongest fire-type katana, showing the story of his strong march into the Naruto world. 3. [The Strongest Ninja of Death: The main character shuttles between the world of Death and the world of Naruto, fighting against various ninjas.] 4. [Ultimate Creature System: The protagonist travels through different worlds through a system that descends from the sky, including Naruto, Pirate, Douluo, etc.] I hope you like this fairy's recommendation. Muah ~š
There are numerous potential storylines. Maybe the Grim Reaper appears during a particularly difficult battle for Naruto. Naruto, being Naruto, would likely try to reason with the Grim Reaper. He might ask the Reaper to spare his comrades or even offer his own life in exchange. This encounter could also lead to Naruto learning more about the afterlife and the true nature of death, which could in turn make him a more philosophical and wiser ninja. It could also change his view on his ninja way as he grapples with the concept of an ultimate end that not even his strength can defy.
Let me recommend a few Doujinshi novels to you. They are One Piece: Death's Vice-Captain, Kinoha: The Shadow of the Fourth Generation, Death's Strongest Ninja, and Naruto's Scourge. These novels were all very exciting and compact, so they should not be missed. I hope you like my recommendation.š
Naruto's Killing Blood. The general plot of the novel was about a boy who accidentally transmigrated to the world of Naruto and became the godson of Tsunake, the disciple of Orochimaru, the son of the fourth generation Naruto, and the brother of the protagonist Naruto Uzumaki. He used the name of Hiroshi Rippling Wind to travel through the Ninja Realm, causing the entire Ninja Realm to tremble.
One possibility is that Naruto enters the world of the Grim Reapers. He could struggle with the new rules and ethics there. Since he was always about protecting life in the ninja world, now he has to deal with death. He might face challenges from other reapers who don't trust this newcomer from another realm.
Naruto would probably develop a deeper understanding of life and death. He's used to fighting to protect life, but now he's on the other side. This new perspective could make him more empathetic towards all beings. He might also become more mysterious to those who knew him before, as his new role would be so different.
Another ability Naruto could gain is a deeper understanding of genjutsu. Shisui was very proficient in genjutsu, especially with his Sharingan. Naruto, being his brother, could have a natural aptitude for genjutsu. He could learn to break through stronger genjutsu more easily and also use more advanced genjutsu himself. This would be a significant change as Naruto was not originally known for his genjutsu skills, but with this new connection, he could become a more well - rounded ninja.
One common theme is power acquisition. Naruto often gains new and strange powers related to the Grim Reaper. Another theme is the exploration of the afterlife or death - related realms. Since the Grim Reaper is associated with death, fanfictions usually have Naruto either visit or be connected to such places.