I'm surprised that most Japanese netorase games feature overweight, flabby fat hags and whales, as I've found that unappealing. It seems that many Western developers and Japanese artists have forgotten what healthy body types look like. When I look at that kind of art from Japan and also Western developers, I'm more likely to feel nauseous than aroused. Perhaps this is a way of coping with the obesity epidemic in real life?
Hey! As someone who enjoys the fat ugly bastard trope, there are a few reasons I think. One of which is, it's unrealistic. The odds of your SO falling for, or sleeping with, such a person compared to your typical stupidly handsome and jacked dude are pretty low. Another, which builds on that, is its an added layer of humiliation. Seeing someone, a powerful/authoritative woman, arrogant woman, demure woman, etc., sleep with such a character is top tier. I personally despise the handsome trope, which I find is significantly more common than the ugly bastard. Especially if you want a good game or hentai. Those are the top reasons I can think of off the top of my head. Then again, maybe it's different for the other connoisseurs