If you just look at the games and nothing else Peach DOES have a character. You can infer a lot about how other people treat her or talk about her. She seems to be a bit incompetent as a ruler, she needs external help to maintain her power and often gets kidnapped by a giant lizard again and again. She's no girl boss but rather someone deeply flawed. But in le current year you cannot have women be flawed, especially in leadership positions.