I think Hinata would be an interesting character to interact with Naruto as a girl. Hinata has always had a bit of a crush on Naruto, and now that he's a girl, it could lead to a very different kind of relationship. They could become closer friends or even something more. Also, Tsunade. Tsunade could be a great mentor for Naruto in her new female form, teaching her things about being a female ninja that she didn't know before.
Sasuke would be really interesting. His relationship with Naruto was always complex, and if Naruto is a girl, it could add a new level of tension or even a different kind of friendship/rivalry. Sakura too. She might have a whole new perspective on Naruto as a girl, and they could form a stronger bond as female comrades. And Kakashi, his reaction to Naruto's transformation could be quite humorous and also a source of guidance for Naruto in this new situation.
Definitely Jiraiya. His reaction to Naruto being turned into a girl would be priceless. He might be a bit flustered at first but then could see it as an opportunity to train Naruto in a different way. Another interesting character would be Ino. Ino could help Naruto with things like fashion or how to act more 'girly' if Naruto is interested in that. And Rock Lee. Lee's pure - hearted nature would make his interactions with Naruto as a girl really fun to read about, as he would likely treat her the same as before but also be a bit more protective perhaps.
Sasuke would definitely be one of the main characters to interact with Naruto. Their relationship has always been complex, and with Naruto as a girl, it could become even more so. Sakura would also interact a lot. She might be both jealous and intrigued by Naruto's new form. Kakashi too, as Naruto's mentor, would have to adjust to this change and guide 'her' in a different way perhaps.
Well, Hinata would be one of the main characters with a different interaction. She might be more open and confident around Naruto as a girl. Tsunade could also play an important role. She might take Naruto under her wing more as a girl, teaching her things about being a female ninja. And Rock Lee might be even more eager to compete with Naruto as a girl, seeing it as a new and exciting challenge.
Iron Man is another candidate. Tony Stark's technology and Naruto's ninja techniques could be a great contrast. They could learn from each other. Stark might be interested in Naruto's chakra - based powers and try to replicate them in some way, while Naruto could be amazed by Stark's high - tech gadgets.
Naruto and the lead character from Warrock would be really interesting. Naruto with his never - give - up attitude and the Warrock lead, who is probably used to a different set of rules and technology. Their clash of personalities and ways of doing things could create some great story moments.
Tsunade would definitely be one. As the most renowned medical ninja in the village, she could either be Naruto's mentor or a colleague. They could exchange medical knowledge and experiences.
Naruto might interact with Eostia's warriors. They could train together, Naruto showing them his ninja combat skills and them teaching him about Eostia - style combat. There could also be some mysterious characters in Eostia, like an old hermit who has some knowledge about Naruto's sudden appearance in their world and could guide him on his journey in Eostia.
Definitely the Teen Titans. Robin would be interested in Naruto's strategic mind and combat skills. Starfire might be fascinated by Naruto's unique culture. Beast Boy and Naruto could bond over their fun - loving natures. And Cyborg would be intrigued by Naruto's chakra - based abilities compared to his technological ones.
He could interact with Ruby. Naruto's energetic and positive nature would contrast well with Ruby's enthusiasm for being a huntress. They could learn from each other's combat styles, like Naruto showing Ruby some of his acrobatic ninja moves and Ruby teaching Naruto about using a scythe.
He could interact with Luffy. They both have a strong sense of justice and a love for adventure. Their meeting would be really interesting as they could exchange stories about their different worlds and fight side by side against the common enemies in Dressrosa.
Definitely Naruto and the Punisher first. Naruto would be intrigued by the Punisher's methods and would try to understand his motives. It's also possible that Sakura could interact with the Punisher. She's a strong - willed character, and she might try to either stop the Punisher if she thinks his actions are too extreme or help him if she sees the good in his goals. And Jiraiya might also be a character who could cross paths with the Punisher. Jiraiya's worldliness and his own sense of right and wrong could lead to some deep discussions between them.