In Fable you make your own character. So that's not the protagonist.
Her being not model attractive actually makes it more interesting if I'm being honest. Fable is about Fables, and not every Fable should be about a beauty queen that can wield a sword. It being different makes it more interesting than the plain old normal imo super hot model face + guns blazing wearing a teenie tiny top. It's cliche, and honestly it's heavily overdone.
I've seen enough Disney princesses in my time, we could use more interesting stories; I want to see the girl with the warped hand, and the wrecked teeth save the world. Because that's a much interesting story.
If you goal is to just get off on looks, there is Instagram and other things out there for that. I don't need instagram models in my video games too.
Of course it only works for the women right. Don't see many men that aren't considered attractive and in shape. Too many Joe six packs and not enough Joey kegs walking around.
It's the same across all media. Body positivity is just about larger unattractive women while we still get the same in shape , non balding , conventionally attractive men.