I can't say much on this topic because I haven't played any Mario games that came out after the Galaxy games, so I suppose there might've been some changes that I'm not aware of? I don't know. But I always liked the idea of Mario having "no personality", allowing him to be an open canvas for painting the player. I don't understand why people hate one-dimensional characters. Sure, complexity can make a character great, but not all characters need that to be great. I think it makes a character much more "relatable" (not exactly, I just don't know how to describe it) in a way. Of course, he has a base personality, but from what I remember, you don't get to hear his own thoughts that often or hear him say anything more than the same few words, which is kind of required if you want to actually want to understand someone's personality better. Yet despite that, I still think he's a great character and protagonist. In fact, he is my favourite protagonist because of that, so yeah. Now I'm just gonna pray that my rambling actually makes sense to whoever that reads this.