So everyone knows about the Gunstar Heroes references in Cuphead but I can’t help but feel this boss is a reference to The Adventures of Batman & Robin on the Sega Mega Drive. Its at very least a huge coincidence.
Its not too clear in these screenshots but they have the exact same method of attacking as well (minus the summoning of ghost mice).
“The Joker is in a slump and nothing that Harley Quinn can do, no matter how ingeniously evil, seems to be able to put a smile on the face of the Clown Prince of Crime. But maybe a captured Batman could put a smile on his face.” - The Batman and Robin Adventures #18: Joker’s Last Laugh (May 1st 1997)
@cartoonnetwork Huzzah for last minute entries! This is my entry to Cartoon Network’s fun little Adventure Time×Lego Batman Movie contest!( Lego Batman was amazing btw, please go see it!) Had alot of fun drawing in the styles of these two! Hope you like it!