He'd probably teach students who are eager to learn and have a sense of adventure. Since Naruto has his own experiences of being different and striving for acceptance, he might attract students who are outcasts or have big dreams. Maybe some students who are from different species or have unique powers in the crossover world.
In a crossover fanfiction, Naruto could teach students who are facing challenges similar to what he once did. For example, students who are trying to prove themselves in a world that doesn't initially accept them. He might also teach students who are interested in learning his unique jutsu and combat styles. These students could be from various fictional universes, such as a steampunk world or a world of mythical creatures. Naruto would be a great teacher for those who want to learn about determination, loyalty, and the power of friendship through his teachings.
Naruto would likely teach students who are in need of guidance. Given his own past of lacking proper guidance at times, he'd be empathetic towards those students. He could teach students who are interested in the ninja way of life, even if they come from a completely different background like a magic - based world in a crossover. He'd be open to students of all levels of skill and potential, as he believes in the power of hard work to improve.
He would probably teach students who are eager to learn alchemy, those with a thirst for knowledge and a bit of a rebellious streak like he had. Maybe students who are not satisfied with just the textbook knowledge but want to explore the deeper aspects of alchemy.
Goku might teach Naruto about the concept of Super Saiyan forms. Although Naruto doesn't have Saiyan blood, he could learn about the idea of unlocking different power levels through intense emotions and training. For example, Naruto could find a way to apply the idea of Super Saiyan rage - like power - ups when he's in a really tough battle and needs that extra boost.
Naruto could teach about the power of friendship and loyalty. In his own story, his relationships with his friends were crucial. He might pass on these values to the RWBY characters, making them understand that they are stronger together. He could also teach them some basic ninja tactics like how to set up traps or how to gather intelligence.
Naruto would most likely inspire students who felt like outsiders. Just as he was an outcast in his own village at first, he'd recognize those students at Duel Academy who might not fit in with the more popular dueling groups. He'd give them the confidence to shine.
Jiraiya could teach Naruto the basic sealing techniques like the Five - Element Seal. This seal can be used to disrupt an opponent's chakra flow. He might also teach him more advanced storage seals, where Naruto could store items or even his own chakra for later use. Another possible technique could be the Summoning Seal, which Naruto could use to summon various creatures or objects.
Naruto might be a great professor for a class on the study of magical creatures. His curiosity and ability to befriend all kinds of beings in his own world could translate well. He could teach students how to approach magical creatures with respect and understanding, just as he did with the giant toads and other beasts in his ninja journey.
He might teach transformation magic at an advanced level. Given his own abilities, he could show students how to transform into complex and powerful forms that are not usually taught. For example, he could teach them how to transform into mythical creatures with special powers.
He might be really surprised. He could find some interesting and creative storylines that combine his world with other elements. Maybe he'd be amused by how others imagine his relationships with different characters from other universes.
The plot could start with Naruto and his friends somehow being pulled into the Matrix world. They initially mistake it for a powerful genjutsu. As they explore, they meet Neo and the other rebels. They realize that the Matrix is a different kind of prison compared to the world they know. Naruto decides to help the rebels fight the Machines, using his ninja skills. Meanwhile, the agents in the Matrix see Naruto and his friends as a new threat and start devising ways to stop them.
Minato would likely focus on Naruto's natural strengths. Since Naruto has a large chakra reserve, Minato could teach him how to better utilize it in combat. This might involve creating more powerful and complex jutsu combinations. Minato could also introduce Naruto to strategic thinking in battles. He might set up mock battles where Naruto has to think on his feet and come up with creative solutions. And of course, Minato would train Naruto in the use of his signature jutsu, like the Rasengan, but with his own unique twists and improvements.