I don't know if you already answer that but could a girl be a princess instead of a prince or is it impossible for a girl to be a prince in any way ?

Classes aren’t Gender Restricted, however if being called a title coded for the opposite gender causes you dysphoria, I’d argue SBURB would work around it like alternative Class names. That being said, Classes and Aspects are meant to be one Syllable, so Queen may fit better.