Crossover headcanons you have for Steven Universe

This mostly concerns crossovers with other Cartoon Network shows, which already happened officially. So what are some headcanons you have connecting Steven Universe to other CN shows? Especially if this were to involve a shared universe? Here's some of mine:

Ben 10: The Crystal Gems were close allies with the Plumbers in the past. Likewise, Rose Quartz, in particular, was a good friend of Grandpa Max. Meanwhile, Vilgax is a widely feared and hated figure on Homeworld.

Codename: Kids Next Door: The Galactic Kids Next Door views the Gem race as an abomination due to how they're literally born as adults and live for thousands of years. As such, they want nothing more than to wipe them off the face of the galaxy.

Dexter's Laboratory: Dexter is bitter rivals with Peridot.

Ed, Edd n Eddy: The Eds have scammed Steven in the past, which has resulted in them being clobbered by the Gems. Despite this, he still considers them friends.

The Powerpuff Girls: The girls occasionally help the Gems fight corrupted members of their kind, and in return, the Gems help the girls in fighting their enemies like Mojo Jojo.

Samurai Jack: The Crystal Gems trained Jack in his quest to defeat Aku. After the samurai was sent forward in time by the demon, they assumed he died of old age due to humans' limited lifespans. They received quite the shock when they reunited with Jack centuries later in the present.