Dude, Rosalina is one of the deepest characters in Mario, she was orphaned at a young age, got lost in space where she became the emotionally closed off mother figure to the lumas and a gaurdian of the universe and eventually met Mario where she finally let herself live a semi-normal life having fun with Mario and his friends, if that's "cringe, bland and boring" to you, you either are taking an overly serface level look at the character or are just making up a reason to hate her or something.