One thing I'm noticing is that a lot of things mentioned on here aren't bad character design, but either overused stereotypes, or just things that wouldn't work in certain genres.
Like catchphrases would work in a cheesy action comic or a silly cartoon, but if you're doing an epic drama... like that bird won't fly.
That and like, I think talking heads is the stupidest thing, but people do like that. So it might just be that, there is no good or bad, just what you like and dislike.
I would like to see someone make a talking penis a beloved character though. Like that's nobel peace prize material right there. GG no RE.