" I Raise Tailed Beasts in Naruto World " might fit the plot of the novel you mentioned. The protagonist transmigrated to the Naruto World and awakened the Tail Beast System. One of the scenes was feeding Nine-Tailed in the mental world. I recommend you to read this novel. I hope you will like it.π
" Naruto: My Psychic Beast is Billion Strong " is a novel that you must not miss. Its plot revolved around the protagonist Naruto who accidentally transmigrated to the Naruto World and became Naruto Uzumaki. He was also bound to the Psychic Beast System at the beginning. After signing a contract with the Psychic Beast, he could obtain the power of the Psychic Beast. This novel added a lot of fantasy elements to the story and had a more special plot than other Doujinshi novels. I hope you will like this novel.
I recommend the following good Naruto Doujin novels with Naruto as the main character: 1. "I Came to the Shinjuku Realm with Lightning in My Arms": The protagonist carried Lightning to the Naruto World and became the brother-in-law of the fourth generation Naruto. He shouldered the heavy responsibility and embarked on the path of becoming Naruto. 2. The protagonist, Zhang Dingyu, transmigrated to the world of Naruto and became the godson of Okami and the disciple of Orochimaru. He walked in the ninja realm and killed shadows like slaughtering dogs. 3. "The Supremacy of Strength of the Wood Leaf": The protagonist transmigrated into Naruto. There is a monster in his body that can devour souls and fuse with the changes in the nature of chakras. He quietly studies chakras and becomes an existence with supreme strength. I hope you like this fairy's recommendation. Muah ~π
Obviously, Naruto is the main character as the story focuses on his growth of the nine tails. Kakashi could also be an important character. He might be the one guiding Naruto in controlling his new power, given his experience and knowledge. Sakura could play a role too, perhaps as a healer in case Naruto gets injured during his power - growth process.
Sometimes, other characters from the Naruto universe might also play important roles in these fanfictions. For example, Kakashi could be involved as Naruto's mentor, giving advice on how to better communicate with the Nine - Tails. Or Sakura might be there to support Naruto in his journey of befriending the Nine - Tails, even if she doesn't directly interact with the tailed beast.
Perhaps an ancient evil spirit that was once sealed away by the nine - tails long ago. Now it senses the nine - tails' presence in Naruto and wants to take revenge on it by destroying Naruto. This antagonist could have powers that are a match for Naruto and the nine - tails combined.
Naruto's character might develop a deeper sense of self - awareness. With the Nine - Tails Cloak, he realizes he has a greater power and responsibility. He becomes more cautious in using it, understanding the consequences of losing control.
πI recommend the following doujin novels to you. They are all about Naruto becoming the main character. There is no BL plot: 1. "Naruto: My Spiritual Beast is a Billion Points Strong." 2. Naruto: The Genius Naruto 3. Zuan Naruto 4. Taoist Immortal Naruto 5. Naruto: Asura Kagura 6. "The beginning of Koba's revenge after becoming Naruto." 7. "Naruto: Killing Blood" 8. [Muye's Strength Supremes] 9. [Naruto: The Strongest Water Escape] 10. "Naruto: Rebirth" 11. "Building the Naruto World" 12. "The Plot of My Collapse in the Universe" 13. "I, Naruto Uzumaki, don't need recognition." 14. "Becoming Naruto with a katana." 15. "Starting from Naruto." I hope you like this fairy's recommendation. Muah ~π
πI recommend Naruto's Journey to You. This is a wonderful Naruto Doujin novel written by the author, Xing Liyou. The main character, Kageyama, was reborn as a nine-tailed human pillar, but he did not complain about fate like Naruto. Instead, he embarked on a journey to find his own goal. In the end, he also shocked the entire Naruto world and became a legendary figure in the history of Naruto! I hope you like this fairy's recommendation. Muah ~π
I recommend " The Sword of Muye Suppresses the World " to you. The protagonist of this novel carries the dnf Ghostblade System and is reborn into the world of Naruto. He becomes the young boss of the Ninja Mandian Hall in Muye Village and shows off his Ghostblade skills. This book is finished, you can rest assured to collect it. I hope you will like this fairy's recommendation.π
Sasuke could be a main character in a Naruto 11 Tails Fanfiction. He has always been Naruto's rival and equal in many ways. His skills and knowledge of the ninja world could be crucial in dealing with the 11 - tails. Maybe he would have a different perspective on how to handle the situation compared to Naruto.