In this fanfiction concept, their relationship could develop through mutual understanding. Naruto, at first, might be shocked but then gradually accept Kyuubi as a brother. Kyuubi, on the other hand, could learn about human emotions from Naruto and become more protective.
Well, their relationship could be super interesting. Naruto is from a world of ninjas and Luffy is a pirate. Naruto might teach Luffy some ninja tricks like stealth. And Luffy would show Naruto the joys of the open sea and adventure. They'd probably support each other no matter what. For example, Naruto could use his shadow clones to help Luffy in a fight on his ship, and Luffy would use his stretchy powers to get Naruto out of a tight spot in a ninja battle.
In the fanfiction, their relationship might be based on mutual respect. Naruto, being a very determined character, would admire Ichigo's resolve to protect his friends and family. Ichigo, on the other hand, would see Naruto's never - give - up attitude as something inspiring. They could train together, with Naruto helping Ichigo with his physical strength and Ichigo guiding Naruto in spiritual awareness. Their brotherly bond could be forged through shared experiences like facing powerful foes and saving their respective worlds.
Well, at first, Naruto might be completely oblivious to Fem Kyuubi's feelings. But as she starts to show more affection, like always being around him when he's in danger or bringing him little gifts in her own unique way, Naruto will start to notice. Then they could start to have more heart - to - heart conversations, which will deepen their relationship.
In such fanfiction, their relationship often develops through mutual respect. Naruto no longer sees Kyuubi just as a source of power but as a friend. Kyuubi, in turn, starts to value Naruto's determination and kindness. They might have heart - to - heart conversations in Naruto's mindscape, sharing their past traumas and hopes for the future.
The relationship development can also be influenced by external factors. If the village starts to view Naruto's connection with the Kyuubi in a more positive light, it can ease the tension between them. This allows for more open communication and deeper training sessions. Eventually, they might reach a point where they are like comrades, fighting side by side not just physically but also in terms of their shared goals for the village and the ninja world.
The fem Kyuubi could be initially attracted to Naruto's struggle with the Kyuubi inside him. She decides to help him. As Naruto's mental state improves due to her efforts, they could develop a romantic relationship. For example, she could teach him how to better control the Kyuubi's chakra, and in the process, they fall in love.
The relationship with the girl Kyuubi could develop in a more romantic way. Naruto's relationship with the regular Kyuubi was mainly about power and control. But with the girl Kyuubi, there could be a lot of mutual understanding and attraction. They might go on dates in the Hidden Leaf Village, sharing their feelings and secrets. Also, she could use her unique Kyuubi - related powers to help Naruto in a more gentle and collaborative manner, rather than just raw power like the regular Kyuubi.
At first, Naruto might be a bit scared or hesitant. But as the female Kyuubi shows her care and concern for him, he would start to trust her. They would gradually develop a mother - son type of relationship. The female Kyuubi could be strict at times to make Naruto a better shinobi, but also very loving.
In many fanfictions, Fem Naruto might show kindness towards the Kyuubi. This kindness could be something the Kyuubi has never experienced before. For example, instead of just seeing it as a source of power, Fem Naruto might try to understand the Kyuubi's past and pain. This could lead to the Kyuubi gradually opening up to her and them developing a deeper bond.
Their relationship might start with Naruto being curious about the fem Kyuubi. He's used to the regular Kyuubi, but this new, female form is different. As he gets to know her, he discovers she has a softer side. And she, in turn, starts to see Naruto not as just a powerful being but as someone with a kind heart.