They could interact through combat. For instance, they might start off as opponents, not understanding each other's ways, but as the fight progresses, they start to respect each other's skills.
Another way of interaction could be through a character who bridges the two worlds. Let's say there is a half - mermaid, half - human character. This character can introduce Naruto to the mermaid world and help the mermaids understand the ninja world, facilitating interactions between different characters from both worlds.
If Courtney is a healer in the fanfiction, she could patch up Naruto after a tough battle. They would then have a heart - to - heart conversation about their dreams and fears. Naruto might share his goal of becoming Hokage and Courtney could talk about her own goals, which might be something like making the ninja world a better place in her own small way. Another way they could interact is if Courtney gets kidnapped by an enemy. Naruto would then go on a rescue mission, and during the rescue, they would bond over their shared experience.
They could start by being suspicious of each other. For example, Homura might think Naruto is a threat to her mission (if she has one in the Naruto world) with his powerful jutsu. Naruto could be confused by Homura's strange technology and time - stopping powers. But then, as they see each other's determination, they start to respect one another and communicate. Maybe Homura helps Naruto by using her time - stop to give him an advantage in a fight, and Naruto in return protects Homura from some of the more dangerous ninja in his world.
They could interact through combat at first. Naruto might mistake Widowmaker for an enemy due to her being an assassin. He could quickly dodge her sniper shots with his speed. Then, they could start to communicate, with Naruto trying to figure out who she is and why she's attacking. Widowmaker, on the other hand, might be intrigued by Naruto's strange abilities.
In naruto and jenova fanfiction, characters might interact through the sharing of knowledge. The scientific minds in Naruto, like Shikamaru or Orochimaru, could study Jenova and its powers. Meanwhile, Jenova - related characters might be interested in the chakra system of the Naruto world. This exchange of knowledge could lead to new power - ups for both sides. Also, there could be situations where Naruto's friends and allies have to team up with characters associated with Jenova to face a common, greater threat.
The interaction could start with a misunderstanding. Rapunzel might be scared of Naruto at first because he looks so different from anyone she has ever seen. But Naruto's friendly nature would soon win her over. They could then team up to face a common threat. For instance, an evil sorcerer who wants to use Rapunzel's hair for his own dark purposes. Naruto could use his Rasengan and Rapunzel could use her long hair to trap the sorcerer and defeat him.
In fanfiction, they could also interact on an emotional level. Naruto, who has known loneliness, could relate to Frisk's journey of self - discovery. They might have deep conversations about their respective goals and the meaning of friendship. Naruto could share his dreams of becoming Hokage, while Frisk could talk about their experiences in the Underground.
Naruto could be initially scared of Zombina because of her zombie appearance but then realize she's not all that bad. They could start by just having simple conversations, like Naruto asking Zombina about her life before becoming a zombie. And Zombina could be interested in Naruto's dreams of becoming Hokage.
They could interact in a more comical way at first. For example, Naruto might mistake Weiss' refined mannerisms for being stuck - up. Weiss, in turn, could find Naruto's loud and boisterous nature a bit much. But as they face challenges together, like fighting a group of Grimm or rogue ninjas, they start to understand and respect each other. Naruto might share his dreams of becoming Hokage with Weiss, and Weiss could open up about her family and her own goals in life.
They could interact through combat. Kratos is a very battle - hardened warrior, and Naruto is no slouch either. They could start off as opponents, with Kratos seeing Naruto as a strange and potentially dangerous being in his new world. But as they fight, they come to respect each other's skills.