Well, it could work by having the different power systems interact. For instance, the chakra in Naruto's world and the gem magic in Steven Universe. The Juubi's power is so immense that it could disrupt the balance in the Steven Universe. Naruto, being a powerful ninja, could teach the characters in Steven Universe about combat techniques that are different from their own. And the gems could introduce Naruto and his friends to new forms of energy manipulation.
In a crossover fanfiction, the settings could merge. For example, Camp Half - Blood could be visited by Naruto. The demigods would be intrigued by his chakra abilities, which are so different from their own powers based on the Greek gods. Naruto could teach them some of his ninja skills in return for learning about their combat techniques. And perhaps the Juubi's presence could disrupt the natural balance of the Percy Jackson world, leading to new and unexpected adventures for both Naruto and the demigods.
Naruto would probably be really excited to meet new friends in the Steven Universe world. He'd be curious about the Crystal Gems and their powers. He might be a bit loud and energetic compared to some of the more reserved Gems, like Pearl. Steven, on the other hand, would be very friendly towards Naruto and would want to learn about his ninja skills right away.
Steven would be really curious about Naruto's ninja abilities. He'd probably ask Naruto to show him all kinds of jutsus. Naruto, on the other hand, would be intrigued by the Gems' powers. He might be a bit skeptical at first but would soon see how useful they can be. The Crystal Gems would be a bit cautious around Naruto at first, not knowing what to make of this strange, energetic boy with such powerful abilities.
A crossover could start with Steven somehow getting his hands on a piece of Voltron tech. This could be something that fell through a wormhole. His curious nature would lead him to try and figure out what it is. Meanwhile, the Paladins of Voltron are on a mission to retrieve this tech. When they arrive in Steven's world, they are shocked to find a world full of Gems. The two groups could then learn from each other's powers and ways of fighting.
Well, one possible plot could be that Naruto somehow ends up in the world of Steven Universe. Maybe a strange jutsu goes wrong and transports him there. He could meet Steven and the Crystal Gems. Naruto's skills in combat and his never - give - up attitude would be really interesting to see in the SU world. He might teach the Gems some new ninja moves, and they could teach him about gem magic in return.
Well, one possible plot could be that Naruto is somehow transported to the world of Steven Universe. He might be confused at first by the Gems and their powers. Maybe he'd team up with Steven to fight off a common enemy like a powerful Gem corrupted by darkness. Naruto could use his shadow clones to confuse the enemy while Steven uses his shield and healing powers to support.
Naruto would likely be very energetic and curious about Steven's gem powers. He might try to learn from Steven and incorporate those powers into his ninja techniques. The harem members would be drawn to Naruto's determination and Steven's kind heart. They would interact in a way that combines the action - packed nature of Naruto's world with the more emotional and relationship - focused aspects of Steven Universe.
One idea could be a crossover where Naruto's world is invaded by the Gem Homeworld from Steven Universe, and the Juubi's power somehow gets involved in the conflict. For example, Naruto and his friends might have to team up with Steven and the Crystal Gems to fight off the combined threats.
He could fit in as a super - powerful outsider. His Juubi powers would make him stand out, but his Naruto - like personality of being friendly and determined would help him make friends. He might use his powers to help the school during times of crisis, just like he did in his own world.
The Juubi could be the main villain or a major threat that brings Naruto and the Justice League together. Its massive power would be a huge concern for both parties.