Most superheroes were created by Jewish men.
I’m pretty sure that’s not accurate.
Admittedly, it’s an inference, but I don’t think the parallels were lost on Lee and Kirby when Magneto used the term provocatively in X-Men #1.
https://www.researchgate.net/profile/Damian-Perez-6/publication/343498108/figure/fig6/AS:921718973550593@1596766336118/Magneto-mentioned-for-the-first-time-the-name-Homo-superior-From-The-X-Men-1-X1-p.jpg
They exist in the same world because crossovers with other comic titles potentially brings in new readers. (The first one is in issue 6, but the Scarlet Witch and Quicksilver were new characters introduced in issue 4—the MCU Avengers would be pretty different if it the Avengers and X-Men never had crossovers. To fit the thread topic, Spidey didn’t show up until issue 35.)
But those crossovers just don’t seem that weird to me. You want weird, how about crossovers with comics created specifically as advertising for a toy or toy line? There were multiple crossovers between Rom and other Marvel lines, including the X-Men and Avengers as individuals and as teams. (Rom himself was spun off to another publisher and can’t be used, but there are encounters with other Space Nights even today.)
Even weirder is Crystar. A short-lived toy line from the early 1980s (I had several of them) it had an 11-issue comic run then disappeared forever. Except that Marvel brought the characters back in a crossover series a few years ago.
https://www.worthpoint.com/worthopedia/huge-lot-saga-crystar-crystal-517373491
The guy with the purple robe and beard is a character in a current Marvel comic line. Except he has been transformed into a horned, winged talking black cat and lives in a school of magic run by Doctor Strange, with teachers including the Scarlet Witch and Magik from New Mutants/the X-men.
https://www.marvel.com/articles/comics/meet-the-students-of-strange-academy
Now that’s weird.
That’s not weird.
Death’s Head is a time travelling robotic bounty hunter, who’s fought Spider-Man and the Fantastic Four. His origin? He was originally created as the host for the consciousness of an evil wizard, but before the wizard could transfer his mind, he was stolen by Dr. Who to help the Transformers win a war in the future.
That’s weird.
I remember Death’s Head from comics I read in the 90s. He certainly was weird.