In a fanfic, they could interact in a shared mission. Say there's a powerful artifact that has been lost between both worlds. The characters from Naruto and Please Teacher have to team up to find it. Naruto could use his tracking skills, while the Please Teacher characters could use their knowledge of science and technology to figure out where it might be.
The characters could interact through a magical portal. For example, Naruto might accidentally stumble through a portal into the Please Teacher world. He'd be confused at first but then start to make friends with the characters there, sharing his ninja stories.
Naruto might be intrigued by Nunnaly's calm and gentle nature. He could introduce her to his friends in the Hidden Leaf Village. They could have conversations about their different worlds. For instance, Naruto could tell Nunnaly about his dreams of becoming Hokage, and Nunnaly could share her own hopes for a peaceful world.
The characters could interact in combat. For instance, Legolas' archery skills could be compared and contrasted with Naruto's ranged attacks using shurikens. They might train together and learn new techniques from each other.
They could interact through music. Since Miku is a virtual singer, her music might have an impact on Naruto. For example, her upbeat songs could give Naruto energy during a battle. Naruto, in turn, could teach Miku about the ninja way and how to be brave in the face of danger.
Well, Mario could teach Naruto about the power - ups in his world. Naruto, being curious, would be eager to try them out. For instance, when Naruto eats a Super Mushroom, he might gain increased strength and speed in a way similar to his Sage Mode but with a Mario - style twist.
In a 'naruto gotham fanfic', Catwoman could be intrigued by Naruto's agility and his different approach to getting around. She might playfully challenge him to a race across the rooftops of Gotham. Meanwhile, Naruto would be trying to understand the complex web of relationships between the heroes and villains in Gotham and would be constantly making missteps due to his lack of knowledge of the city's ways.
Naruto would probably be very friendly and open with the good characters. For example, he would likely be excited to meet Twilight Sparkle and would share his stories of his own world with her. He might be a bit cautious around Nightmare Moon at first, but once he realizes she's a threat, he would be very confrontational.
Conor might initially be in awe of Achilles. Since Achilles is a great warrior, Conor could look up to him and try to learn from his combat skills. For example, he could ask Achilles to teach him how to use a spear effectively.
Aladdin could be in awe of Hercules' strength. He might ask Hercules to show off his feats of strength, like lifting a huge boulder. Hercules, in turn, would be interested in Aladdin's street - smart ways. For example, Aladdin could teach Hercules how to haggle in the marketplace.
The characters can interact in many ways. For example, Naruto could teach Shaggy some basic ninja moves like how to run really fast or be stealthy. In return, Shaggy could introduce Naruto to the joys of Scooby Snacks. Sakura might befriend Daphne, and they could share their experiences of being part of a team.
The Anbu would probably be very guarded in his interactions at first. He is used to secrecy and stealth. But the girl, with her Naruto - inspired enthusiasm, might break through his cold exterior. For example, she could start talking about her favorite Naruto characters and their values, which might make the Anbu reflect on his own actions.