The Upside-Down Girl has no defined personality. However, it has been confirmed that she has become impervious to nausea from the many times she hung from her bar. It is possible that she is violent when angry as seen when she warned T.J. that he'd be sorry if she got off her bar. She is almost always seen hanging upside down, the only time she is seen right side up is in "The Game" where said game manages to enamour her to that point.