This is a small thing that popped in my mind, enjoy.

Harry Potter/Steven universe crossover

Info

-Gems are recognized as intelligent magical creatures like centaurs and goblins.

-Lily is half gem, adopted by the Evans family, her gem is an Emerald located on her Heart.

-James is a human and so are the rest of the Marauders (Lupin excluded naturally) and Snape.

-Hogwarts is more open to hybrids than canon, much to the disgust of the Purebloods fanatics.

-Voldemort is a human- gem hybrid,but not a natural or NORMAL one , after hearing that gems are basically Immortal, he executed a dark ritual to make 6 innocent gems tied to his soul, thus corrupting them.

He scattered these Horcruxes like in canon, but with less protections, seeing how they can very well neutralize any threat in their corrupted forms.

-Lily sacrifices her gem and powers so Harry can be born, making him half gem and rendering her to barely a quarter gem.

-Harry is born with Lily's gem on the Left side of his forehead, Lily doesn't question it and just accepts it.

-Trelawney, a quarter Sapphire, speaks the prophecy.

-Neville is born without his father's gemstone, making him a disappointment to the eyes of others, his mother is tortured as in canon and his father ends up partially corrupted, the medwizards barely keeping the corruption from spreading. Rendering both in no condition to leave Saint Mungos

Augusta Longbottom sacrificed her gem like Lily for Frank (Neville's father) to be born.

-Voldemort has his curse rebounded on him when he tries to kill baby Harry, Harry is only left with a Red lightning bolt pattern on his gem, many now call him a Bloodstone instead of an Emerald.

-Dumbledore leaves Harry to the Dursleys like canon

-Harry, in addition to having accidental magic like canon, he now has his power to control

Here is a list of said powers

-An affinity to plants, not really Chorokenisis, he feels free when surrounded by plants and Plants just generally grow better around him.

-A slight healing and calming aura, affecting him and those he cares about. Wounds of the flesh and mind heal faster for his loved ones.

-Instead of speaking to snakes, Harry has the acquired power to manipulate blood, he hates using it since he can "control" people with it, but at some points in the story it may be necessary instead of Parseltongue.

-His shapeshifting may be more effective than Steven's, maybe as he Learns Transfiguration he will bring it to a decent level.

-He doesn't have a weapon, he has a wand and the acquired Gryffindor sword.

Hemione and Ron are full Humans, Harry, being half human, technically has the ability to fuse.

You are free to make them half gem is you want, as long as it fits the story.

The other stuff is up to the Writer to decide, Have fun!

AB.