Fff, oh, hon. You don't come off as a mean mun at all! At least, you don't seem at all like that to me~

And I think you're playing Rhyme just fine! I might suggest that you be a bit more cheerful with her, though? Also, sometimes you've portrayed her as very... stereotypically little sister-y, and while she is, you know, a little sister, she's also very capable, very on-point, and she knows how to get stuff done. But beyond that, you play her awesomely. Just sayin'.