I think the non-official canon is Bikini Bottom is near Bikini Atoll, the site of nuclear weapons testing in the Pacific Ocean. Radiation created anthropomorphic sea creatures like SpongeBob. I like your idea of Mermaid man/ Barnacle action figures… maybe irradiated ones at that.
My headcannon was always that they were action figures. The episode where they all go on the surface shows all of the characters as puppets
so in my head all of the characters are real items that are being animated by some sort of undersea magic.
I think the non-official canon is Bikini Bottom is near Bikini Atoll, the site of nuclear weapons testing in the Pacific Ocean. Radiation created anthropomorphic sea creatures like SpongeBob. I like your idea of Mermaid man/ Barnacle action figures… maybe irradiated ones at that.
Radiation magic, just like in Fallout!
Also lots of bullet magic
You should watch the skin theory video if you want to fuck your head canon.
https://youtu.be/Vb-ajY8M6gI