She seems to sound a bit Korean and has a pretty voice, and that's all nice n charming and what not, but then I found her character design and found out she looked like
THIS. SHE'S LOLITA. My mind was blown and she quickly became my favorite Vocaloid. This was just a tidbit that brightened my day. I hope it does yours too. If anyone else knows anything about Mayu feel free to chat me up about her!