The feeling of cheaply produced 80s and 90s cartoon productions. Clean, minimal lines with no or very little lineweight variation. Bright colors and distinct silhouettes. Facial structures somewhere between to 80s TV cartoon anime, which were themselves often inspired by American cartoons and not nearly as distinct as modern anime most often is, and American comic books as drawn by Jim Lee or JRJR. Big influence of technology designs from blocky designs like Transformers, and comics like Liefeld where guns or robots are just stuffed with nonsense greebles.
Or at least I’m trying.
I don’t know, but I do know copyright and patent are two different kinds of protection, so it might be useful to look into how you think the shape would be protected.
Copyright would be for a creative work, and the enforcement by the right holder is allowed to be loose in selectively pursuing violators without losing protections.
Patent is for useful inventions or designs rather than expressive works. Skimming the Theodore G Brown soap, it seems much more involved than a simple shape and I can see why it was able to be patented.