Allow me to explain the concepts behind these 2 villains designs:

The Fat Old Woman:
I remember when I was little, my grandmother will whoops us kids in the ass with a cane or a feather duster should IF we misbehave. Grandmothers are mostly matrons in large Chinese families back then and they are still now.
This Reaper is in an muscular, over-sized old woman with a humongous rod cum feather duster, which is meant to resembles the canings that haunt children.

The Killer-Clown Principle:
I went to Chinese primary school and to be frank, I've never really likes school as homeworks are always mountainous and I also get whooped by school teachers for not handing up my homeworks. Therefore, I tend to imagine them as clowns from circus and how they are meant to be laughs for school children in class and at assembly. What more, I know some people are afraid of clowns. This Killer-clown Principle is armed with a chainsaw and a man-eating plant on his chest.