I've noticed that girls who are attractive and know they're attractive are often boring. Girls who are attractive and don't know they're attractive are often less boring/kinda interesting. Unattractive girls are often interesting and funny.
And the reason? Because attractive girls who know they're attractive don't NEED to develop a personality to get on in life. They get boyfriends easily, get jobs easier than others, and a load of other benefits. Whereas unattractive girls need to be funny, likeable, interesting etc.
I told a friend this once and she told me that maybe I just focused on the attractive girls looks too much so I didn't notice their personality. But I've lived with, been friends with, and had relationships with boring attractive women and I really got to know them, to the point where I didn't notice their looks any more, and I still found them to be, like...empty vessels. At least compared to my unattractive female friends.
Oh yeah, and obviously there are exceptions to the rule.
Most Helpful Girl
I agree that there's a coloration, but it's not a 100% thing. I think that there's a higher percentage of attractive people who are arrogant, bitchy, boring, etc. than unattractive people. And there's also a higher percentage of unattractive people who are kind, funny, interesting, etc. than attractive people. Mostly because of the reason you stated.
Attractive people are used to getting attention easily simply from their looks, no extra effort needed. So because of that not many of them choose to develop an awesome personality to go with their looks. Then there are the unattractive people who obviously don't attract much attention just from their looks. As such, they have to develop more enticing personality traits to catch people's attention.
Basically good looking people are spoiled with attention, where as unattractive people have to work for initial attention. And this applies to both genders, not just females.