Who could be the main villain in a Steven Universe and OK KO crossover fanfiction?

A possible plot could involve a gem experiment gone wrong that creates a threat that spans both universes. Steven, being an expert on gem-related things, and KO, who is always ready to save the day in his world, join forces. They meet at a neutral zone between their worlds, which is being affected by the chaos. Together, they have to find the source of the problem, which is a gem - machine hybrid that is sucking the energy from both universes. They encounter various challenges on their journey, like dealing with gem traps andobox security systems. Along the way, they also make new friends from both universes who help them in their quest to stop this hybrid threat.

Enid from OK KO and Pearl from Steven Universe. Enid is a bit of a cool, laid - back character with her own brand of strength, and Pearl is a very refined and skilled gem. They could have a great dynamic, like Enid teaching Pearl some modern - day Earth things, and Pearl showing Enid some of her elegant combat moves.

Perhaps OK KO travels to Steven's universe and is amazed by the different types of gems and their abilities. He could learn from Steven about gem culture and in return, teach Steven some of his cool fighting moves. This could lead to them going on an adventure together to help a group of gems who are in trouble.

It could be an evil ninja who has somehow gained access to Gem technology. He uses the power of the Gems to enhance his own jutsu and becomes extremely powerful. His goal could be to take over both the Naruto world and the world of the Gems.

If it was a crossover with "She - Ra and the Princesses of Power", Adora could be a main character. Her strong leadership and the power of She - Ra would be an interesting contrast to Steven's more laid - back leadership style. Together, they could fight against a common enemy that threatens both their worlds.

Definitely Steven from Steven Universe. His kind and curious nature would contrast well with Ok Ko's more action - oriented personality. Plus, their different powers would make for an interesting dynamic. They could learn a lot from each other, like Steven could teach Ok Ko about gem culture and Ok Ko could show Steven some new karate moves.

Enid is also a favorite. She's strong and has a cool personality, so in fanfiction she might be involved in some exciting battles or have her own sub - plot about her past or her relationships.

A crossover with Adventure Time would also be cool. Ok Ko could end up in the Land of Ooo. He might team up with Finn and Jake to battle some sort of evil force that threatens both the plaza and Ooo. They could exchange their different fighting styles, like Ok Ko's formal karate training compared to Finn's more improvised sword - fighting.

Rad would also be a common main character. He's KO's friend, and in the fanfiction, he might be involved in some sort of lemon - inspired adventure with KO. Maybe they go on a quest to find the rarest lemon in the world or something.

The mash - up of different settings. The Ok Ko world with its own set of rules and the Nexus world which is likely very different. When combined, it creates a really unique backdrop for stories.