In a fanfic, the concept of chakra could play a major role in their friendship. Naruto's positive chakra might influence Kurama's dark and angry chakra. Naruto could start sending his friendly and warm chakra towards Kurama, which Kurama initially resists but then starts to accept. This chakra exchange could be the foundation of their friendship. As Kurama gets used to Naruto's positive energy, he begins to open up and see Naruto as a friend rather than just a host.
In a fanfic, Naruto and Kurama could become friends when Naruto starts to understand Kurama's pain. Naruto, being the kind - hearted person he is, might try to communicate with Kurama on a deeper level. He could share his own feelings of loneliness and being an outcast in the village at first. This mutual sharing of emotions could break the ice between them and start the process of friendship.
Well, it could happen through battles. As Naruto fights more and more using Kurama's power, they might develop a sort of comradeship. For example, when Naruto is in a really tough fight and Kurama realizes that Naruto is not just using him but actually values his strength. This could lead to a change in Kurama's attitude towards Naruto, and gradually they become friends.
Chapter 428, "Stunning Debut!", is the clearest early answer because it turns Another Youth Trainee's situation into a concrete plot event.
Chapter 236, "The Murderer Returns to the Scene of the Crime Theory", is the clearest early answer because it pushes Jiang Li into a new phase or setting. A useful checkpoint is the way the scene starts with The short-haired youth beside them chimed in, "That's right, senior,...
Chapter 596, "Then Blow Them All Up", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. Early on, Jiang Li shook his head without any expression.. By the end, They were stunned for a few seconds before they rushed toward Jiang....
Chapter 313, "Grandpa, You Scared My Guest", is the clearest early answer because it turns Shi Xu's situation into a concrete plot event. Early on, When he was brought in, Zhou Wenshu was still in a fog.. By the end, Zhou, hello, I am Jiang Li, it's a pleasure to meet you." Zhou Wenshu....
Chapter 281, "Zhao Lang, Are You Willing to Take a Gamble?", is the clearest early answer because it turns Gamble's situation into a concrete plot event.
Chapter 280, "Tonight, the entire village of you will have to apologize for my brothers!", is the clearest early answer because it turns Tonight's situation into a concrete plot event. Early on, The small mountain village was already dark and lightless at night,....
Chapter 404, "The Vice Dean of Hua Country Chinese Medicine University?!", is the clearest early answer because the rescue effort creates visible on-page results. The chapter gives readers a real answer by opening on Several minutes later, Jiang Li doubled back and knocked on Huo...
Chapter 430, "I Quit", is the clearest early answer because it turns Director Zheng's situation into a concrete plot event. It opens with Hey, do we join a team that's short on members, or do we form our... and closes on You still have time to quit." "Who said I was quitting?" Jiang Li....
Chapter 148, "None are Normal", is the clearest early answer because it turns Du Qinglian's situation into a concrete plot event. The chapter turns that into something concrete by moving from Exiting the cottage, Director Sun picked up the phone.
Chapter 360, "There's No Shame in Wearing a Dress Designed by Your Mother", is the clearest early answer because it turns Liu Suqing's situation into a concrete plot event.