One popular crossover is having the Crystal Gems from Steven Universe team up with the Avengers to fight a common enemy. For example, they could battle a powerful alien threat that neither group could handle alone. The unique powers of the Crystal Gems, like Garnet's future vision and Steven's healing powers, combined with the Avengers' superhuman abilities would make for an exciting story.
Another great crossover could be centered around the concept of magic. The Scarlet Witch from the Avengers has her own brand of magic, and in Steven Universe, there are lots of magical elements. They could explore how their magics interact, perhaps with the Scarlet Witch learning from the Crystal Gems about their unique form of gem - based magic and using it in new ways in her battles.
One creative crossover could be Ben using his alien forms in the world of Steven Universe. For example, Heatblast could help with some of the gem - related heat - based problems. Another could be Steven's healing powers affecting Ben's aliens in a unique way, like speeding up their recovery if they get injured during a fight. And perhaps the Omnitrix could interact strangely with the gem technology, leading to new power combinations.
A really interesting crossover is when the Gem technology and Naruto's jutsu are combined. For instance, the Gems' ability to teleport could be compared to some space - time ninjutsu. It's fascinating to see how the two different power systems interact.
When the Star Wars spaceships visit the world of Steven Universe. Just imagine the Millennium Falcon landing in Beach City. The reactions of the local characters like Steven and his friends would be hilarious. And the pilots from Star Wars would be equally amazed by the strange and beautiful world of Steven Universe.
Peridot is quite popular too. Her unique personality, especially her growth from a somewhat antagonist to a more friendly character, makes for great storytelling in crossovers. In a crossover with 'Ben 10', Peridot's technological knowledge could be paired with Ben's Omnitrix - related adventures.
One popular trope is the fusion of Pokemon with the Gems from Steven Universe. For example, a Pikachu - like Gem or a Gem - powered Pokemon. It combines the unique powers and characteristics of both universes in an interesting way.
One interesting crossover could be Naruto characters in the world of Steven Universe. For example, Naruto's ability to use chakra could be a unique power in the SU universe. Maybe he could use his Shadow Clone Jutsu to help out in a gem battle. Another could be Steven trying to understand Naruto's ninja way and learning some of his moves to defend Beach City in a new way.
Another possibility is a crossover with "Gravity Falls". Dipper and Mabel could come to Beach City during a mystery involving Gem technology. Their knowledge of the strange and unusual from Gravity Falls could combine with Steven's understanding of Gem lore to solve the mystery.
A fanfiction could involve a crossover where the Avengers are shrunk down to the size of the Gems in Steven Universe. They have to adapt to this new world and its rules. For example, they might have to learn how to use Gem weapons and powers. In return, they could teach the Gems about human combat techniques that are different from what the Gems are used to. This would create a lot of humorous and action - packed situations.
One popular theme could be exploring different relationships. For example, how a female Steven would interact with the existing characters like Pearl, Amethyst, and Garnet. Maybe she'd have a different dynamic with them, bringing out new sides of their personalities. Another theme might be self - discovery. Since Steven in the original series has a journey of understanding himself and his powers, a female Steven could have a similar yet distinct journey, perhaps facing different challenges due to being female in the Crystal Gem world. Also, themes of friendship and loyalty are likely to be explored, as they are central to the 'Steven Universe' series.
Steven himself would be very interesting. His kind - hearted nature and unique powers would stand out among the Avengers. He could bring a new perspective to the team.