I drafted out some ideas for a crossover with Steven Universe and Godzilla.
>Would take place in an altered version of the Showa timeline(Destroy All Monsters wouldn't have happened in this timeline, non-Godzilla Toho kaiju films like War of the Gargantuas and Frankenstein Conquers the World are canon, King Kong Escapes is a sequel to King Kong vs Godzilla, etc.)
>Monsterland from DAM is established, however it's partially used as a radioactive material dumping ground, thus causing most kaiju to grow to their Heisei/Millennium sizes
>SU-wise, it would take place sometime during Season 5, after "The Trial" and before "Reunited"
>Yellow Diamond would gain control of King Ghidorah and Gigan
>Several robot/alien kaiju are explained by Peridot to have been made by Homeworld and sold to other alien races/used during the gem wars and left dormant on Earth(Moguera from The Mysterians and Hedorah from Godzilla vs the Smog Monster respectively)
>Homeworld would end up creating SpaceGodzilla by combining Godzilla's DNA with the essence of Yellow, Blue, and White Diamond.
>For the first time, humans would get involved, using Maser tanks and other Japanese golden age sci-fi weapons to fight off invading homeworld ships and the kaiju present in the story
>There would be a fight between Gigan and Alexandrite in the Kindergarten
>Appearing kaiju would be Godzilla, Mothra, Rodan, Anguirus, Minilla, King Ghidorah, Gigan, a rebuilt Mechagodzilla, and SpaceGodzilla.
>Debated having Megalon, Jet Jaguar, and Baragon appear as well, though didn't want to have it get too crazy with the monsters.
>Godzilla, Rodan, and Mothra appear in their designs from Final Wars(Rodan colored to resemble his classic brown design). Gigan would initially appear in his Showa form then get upgraded to his Final Wars form.
>"Reunited" would occur, which is where SpaceGodzilla would make his debut.
I would love to write this out, but I don't know if I have the time with school and other projects I'm working on.