Kurama might become angry at first. He's a powerful being and being neglected would likely wound his pride. He could start causing some minor disruptions inside Naruto, like making it harder for Naruto to access his chakra.
His friends' reactions could vary greatly. For example, Choji might be a bit scared at first, seeing Naruto as a wolf. But once he realizes it's still Naruto, he would offer him food. Ino could use her mind - transfer jutsu to communicate with Naruto in his wolf form. And Hinata would be very concerned and would stay close to Naruto, trying to protect him from any harm that might come his way because of his new form.
Sakura might be really surprised at first. She could be a bit skeptical about whether it's really Naruto or some kind of trick. But then she would probably try to help him find a way to change back.
One way is through shared experiences. For example, they could go on a journey together outside the village. During this journey, they face challenges like bad weather, lack of food, and dangerous animals. As they overcome these challenges together, their bond grows stronger. Also, Naruto could introduce Kurama to his friends, and Kurama could learn to interact with humans in a more friendly way. This would show that their relationship is not just about being sealed together but about true friendship.
Kurama might be a bit confused at first. A baby is not what he expected to see. He could be less aggressive than when Naruto is older. Maybe he'd just watch the baby Naruto curiously.
Kurama might be surprised. Since Naruto is just a toddler, Kurama may not expect such a small and seemingly harmless being to be his future host. He could be a bit more gentle in his initial reaction compared to when he first met older Naruto.
Sasuke would probably be enraged. He has his own sense of justice and loyalty, and seeing Naruto in such a state because of the villagers would make him want to take revenge on those responsible. Sakura, on the other hand, would be heart - broken and would immediately try to heal Naruto using her medical ninjutsu skills.
One common theme is understanding. Naruto has to understand Kurama's past and his pain, and Kurama has to understand Naruto's dreams and determination. Another theme is mutual respect. They learn to respect each other's power and existence. For example, in many fanfictions, Naruto respects Kurama's strength and Kurama respects Naruto's willpower.
In some fanfictions, Naruto and Kurama start to understand each other during their battles. As Naruto constantly shows his determination and never - gives - up attitude, Kurama begins to respect him. For example, when Naruto is facing a powerful enemy and still tries his best even on the verge of exhaustion, Kurama sees his tenacity and starts to have a change of heart. This is a common way for them to start building a friendship in fanfiction.
In some fanfictions, Naruto becomes friends with Kurama through deep conversations. Naruto, being persistent, tries to understand Kurama's pain and anger. He shares his own experiences of being alone and ostracized. This mutual sharing of feelings gradually breaks down the barriers between them, leading to friendship.