>>5795611Honestly I just assumed Araki got stricken with the idea that he often sees regular businessmen living their lives day by day without many interesting things and the fact Cats are usually household pets for many which could lead to Killer Queen's design inspiration next to the actual song by Queen. This was further cemented with the entire chapter dedicated to Kira dealing with a cat who becomes a plant later on.
I even distinctly remember him mentioning that he finds cats fairly creepy but I'm not sure if that was an interview or one the little quotes he writes on certain pages.