In general, Muyu is a sensitive and thoughtful girl. She has a sweet and playful disposition, especially towards her viewers, but often gets shy when expressing genuine affection. As a result of being babied by her debut-mates (given that she is Ranunculus' youngest), she likes to present herself as being older and more mature than she actually is. However, she has a tendency to engage in sekizui (脊髄, reflexive) or nōshi (脳死, brain dead) styles of commentary, which means she usually ends up with the role in collabs.
Despite not being a succubus, she tends to unintentionally make people fall for her, as she has been described as having a naturally charming and "naughty" personality and a warped sense of personal space; Kenmochi Toya even introduced her as someone with a "lewd character" for a NIJISANJI tournament. For example, she once nonchalantly answered a on-stream call from Ishigami Nozomi while naked in the bath, and has casually revealed yabai things about herself, including that she dislikes wearing clothes and that her butt is quite large in proportion to the rest of her body. While she is somewhat puzzled by her reputation, she is not entirely surprised by it, as in her own words, she has always been a "sexy onee-san" though she perhaps puts a bit too much emphasis on the onee-san part.