Naruto could also interact with Weiss. There might be some initial clashes due to their different personalities. Weiss is more refined and Naruto is more brash. But over time, they could come to respect each other's strengths. He might also teach her some ninja stealth techniques.
Yang would also be a great character for Naruto to interact with. They both have a lot of energy and a love for combat. They could have some really exciting sparring sessions together, and Naruto could show Yang some new ways to use her semblance in combat.
Well, one possibility is that Naruto arrives at Beacon and his ninja skills make him stand out immediately. He could befriend Ruby and the others quickly, and they'd be amazed by his shadow clone jutsu. Maybe he'd help them train in new combat styles.
Obviously, Koyuki herself would be a main character to interact with Naruto. She might show him around her place, introduce him to her people. Also, any of her loyal guards or advisors could interact with Naruto. They could be initially suspicious of him but then grow to trust him as they see his good intentions.
Ruby Rose for sure. She's the main character in Remnant and Naruto would likely be drawn to her energy and determination. He could also interact with Weiss Schnee. Naruto might be interested in her family's power and wealth, and Weiss could be curious about Naruto's strange abilities. Another one could be Blake Belladonna. Given her past and her more reserved nature, Naruto might try to befriend her and help her open up more.
If Naruto goes to Beacon in a fanfiction, he could form interesting friendships. He's so full of energy and determination. He'd probably bond with the more energetic students at Beacon. His rasengan could be a really cool and powerful move that no one at Beacon has seen before, and it could be a great addition to the battles there.
He would surely interact with Lagoona Blue. Since Naruto loves water-based techniques, he might be interested in Lagoona's mermaid - like abilities. Also, he could meet Cleo de Nile. Naruto would probably be amazed by her confidence and the fact that she's a mummy. They could have some really interesting conversations about their different cultures and powers.
In this fanfiction, Naruto could come across some of Kumo's young shinobi trainees. He could inspire them with his never - give - up attitude. And there's a chance he'll meet some of the village elders in Kumo who might have different views on how to deal with him, either seeing him as a potential asset or a liability.
Naruto might meet some young and talented Kumo ninjas. They could be eager to test their skills against Naruto or learn from him. Maybe there are some unique characters like a Kumo ninja with a special bloodline limit that Naruto has never seen before.
He would likely interact with the Dragonborn. They could have an interesting exchange of skills, with Naruto showing off his Rasengan and the Dragonborn demonstrating shouts. He might also meet the various Jarls in the different holds, trying to understand their leadership styles which are different from the Hokage in Konoha.
In this fanfiction, Naruto will surely interact with his friends who might be trying to break him out or at least communicate with him from the outside. Inside the prison, he'll encounter inmates with diverse personalities. There could be a wise old prisoner who imparts some valuable wisdom to Naruto. Also, there may be a group of inmates who form a sort of gang within the prison, and Naruto has to either fight them or make peace with them depending on the situation. And of course, there could be a mysterious figure who seems to know more about Naruto's presence in the prison than he himself does, and Naruto will have to figure out this person's motives and identity.
It could be Orochimaru. He's always been interested in Naruto's power. He might use some new jutsu or experiment on Naruto to make him go berserk so he can study his power in that state.