Mayu is.. well a 14 year old yandere that acts cute and looks cute but carries an axe in her pocket for safe keeping. She litterally grips onto her little stuff bunny like she's choking it while she sings-cause there's a mic in the bunny for some reason. She's a bit... protective when it comes to other girls and her senpai. If you want help looking for a voice reference, the song Elsa-Maria could help you out with what she sounds like. I would say, pretend to be adorable at first then go yandere. If you want a good song example for her voice rang, look up A lie and A stuffed animal.