I keep seeing more and more of these fusions, if you'll excuse the pun, between 'Steven Universe' and 'My Hero Academia'. The blend usually hinges on finding a thematic bridge. Gems are essentially beings with innate, singular powers, which isn't too far from Quirks if you squint. The most common tactic is to recontextualize Gem biology as a type of Quirk, either a lost ancient one or a new mutation. This lets Steven or the Crystal Gems enroll at U.A. and interact with that world's rules.
But the really interesting stuff happens when writers don't just transplant the characters but merge the core philosophies. 'MHA' is all about societal structures, hero licenses, and the public perception of power. 'Steven Universe' dismantles authoritarian systems through empathy and understanding. A Deku who internalizes Steven's pacifism, or a Pearl trying to navigate the rigid hierarchy of a hero agency, creates fascinating friction. I've read one where Lapis Lazuli's trauma and power were treated as a villainous Quirk by the public, forcing the heroes to confront their own prejudice.
The technical blending often comes down to how Gem powers interact with Quirk science. Can a healing spit Quirk be analyzed by Recovery Girl? Would Garnet's future vision be registered as a cognitive-type Quirk? Writers have fun with these logistics, but the emotional core is what makes a crossover stick, not just the power-swapping.