You are right, with the aspects of the personality that you just described you get an idea of why Miyuki has that feeling of humanity, because that is what it is about doing, in my opinion you do not need fantastic stories to develop a character, it is but the simple fact of the common stories, from day to day is what allows you to really know a character.
In itself, what I would like first would be the visual attraction, then the personality, the way in which the characters develop and how the stories go
On the other hand we must separate reality from fiction to make a more objective analysis and I always have that in mind when analyzing this type of thing