Naruto's character could develop through his interactions with the characters in Rosario Vampire. If he befriends some of the more friendly vampires or other creatures, he could learn about loyalty and friendship in a different way. He might also face moral dilemmas that are different from those in his own world, such as dealing with the idea of vampires needing to feed on blood. These experiences would shape his character in new and interesting ways in the fanfiction.
His relationship with the Kyuubi could also change in the context of the Rosario Vampire fanfiction. Maybe the Kyuubi senses the unique supernatural elements in this new world and warns Naruto about certain hidden dangers. This could lead to a deeper bond between Naruto and the Kyuubi as they navigate this strange new place together. And Naruto could gain new abilities or ways of using his chakra influenced by the Kyuubi in this different setting.
One idea could be that Naruto, with the power of the Kyuubi, somehow ends up in the Rosario Vampire world. He could use his ninja skills and the Kyuubi's chakra to face the various supernatural threats in that world. Maybe he teams up with Tsukune and the other characters to protect the school from an even greater evil.
Naruto could be a new student at the Yokai Academy. His presence with the Kyuubi's power would disrupt the balance. For example, the vampires might see him as a threat or a potential ally. He could use his shadow clones to spy on different factions, like the witches or werewolves, to understand the politics of the school better.
One interesting fanfiction could be where Naruto, with his Kyuubi powers, somehow gets involved in the world of Rosario Vampire. Maybe he's on a mission and stumbles upon the school. It could be a story full of action and unique character interactions.
Naruto would probably be very curious about the vampires and other creatures in Rosario Vampire. He'd be his usual friendly self, trying to make friends. The vampires might be initially wary of him, especially with the Kyuubi's power, but his positive attitude could win them over. Tsukune, from Rosario Vampire, could learn a lot from Naruto about determination and fighting spirit.
Hinata could start training with Naruto specifically to understand the Kyuubi's power better. This would not only bring them closer but also let her learn new techniques. As she trains, she might discover hidden aspects of her own Byakugan in relation to the Kyuubi's chakra, which would develop her character in terms of power and knowledge.
I'm not sure if there is such a specific fanfiction where a character from Rosario Vampire is reading Naruto fanfiction. Fanfiction can be very diverse, but this seems like a rather unique and specific concept. It's possible that it might exist in the vast realm of fan - created stories, but it would be quite difficult to find without a more targeted search.
In a Naruto, Kyuubi and Rosario Vampire fanfiction, there could be a plot where a character from Rosario Vampire travels to the Naruto world and discovers the legend of the Kyuubi. This character could then try to bring the power of the Kyuubi back to their own world, creating a whole new set of adventures and challenges as they deal with the different cultures and powers in both worlds.
In fanfiction, Naruto's relationship with the Kyuubi can be developed by having them communicate more often. For example, Naruto could start to have regular conversations with the Kyuubi in his mind. This would allow them to understand each other better.
In some fanfictions, the blend starts with Naruto being transported to the Rosario Vampire world. His Kyuubi powers are something completely new there. The power dynamics in the Rosario Vampire world are mainly based on vampire and monster abilities, and Naruto's chakra and Kyuubi - enhanced skills disrupt that in an interesting way.
One way to develop Naruto in relation to the Kyuubi no Kitsune is to have him face internal conflicts. The power of the Kyuubi is both a great asset and a potential danger. Naruto could struggle with the fear of losing control. Through this struggle, he could learn self - discipline and gain a stronger sense of self. Also, he could be developed by learning the history and culture associated with the Kyuubi. This knowledge could make him more well - rounded and respected among other shinobi.