"it's about personality"

I lurk here a lot for some perspective and for a reminder of what I DON'T want my loneliness to turn me into (it's hard sometimes), but lately I've been thinking, what makes a GOOD personality vs a bad personality? There was a recent thread with that gigachad looking serial killer esque incel and everyone in the comments was like, "it's not his looks..." and it's obvious why a lot of people get cast into the shadow realm, but I've wondered what other more subtle things can doom people to a lifetime of being alone.

I personally don't think I have a very good personality (I'm also really ugly, which uhh, sucks) but I seem to not really understand why people IRL dislike me. I'm very shy and reserved (people have legit asked me if I'm mute/deaf once or twice) so I think that's part of it but I've always wondered what else it is that's wrong with me that no one likes me even in a platonic sense.

So what is it!? What makes someone have a good personality vs a shitty one!? Is there an optimal personality that you can personalitymaxx for!? Do all good personalities converge on a certain standard of personality like a limit in calculus? Are there varied bad personalities!?

I just don't really understand.