Hmmm I'm trying to think of character design tropes in anime that I always find amusing but not necessarily bad. Like for Shonen anime the main character usually has bright colored hair that's spikey, and his foil rival has dark hair (usually black) that lays more flat because he's emo and cool.
A trend that I dislike in romance webcomics is that all the lead guys or male love interests aren't very manly. Like I don't mind the abs, but none of them have any body hair or facial hair - not even a little stubble. And they're all freakishly tall and lean, almost feminine xD
I can't stand the K-POP BL look. The "BTS boy group" look is what I call it, and sooo many korean comics style the dudes like this. They all look like women with short hair to me lol