The Batspider-verse merges the Batman universe with the Spider-Man universe imagining a world where both comic series are honored and combined in a shared history.
Doctor Octopus + The Penguin
Joker + Green Goblin (this one was hard)
Superman + Thor
Elektro + Scarecrow
X-Men + Teen Titans
Riddler + Mysterio
Venom + Two Face
Kraven + Rha’s al Ghul
Bane + Rhino
More Batspider-verse sketches and characters here.