"Gender bender"

In fiction, the term gender bender may refer not only to characters modeled after real-life gender benders, but also to characters who undergo changes in their physical sex – magically or otherwise – throughout the story. A work of art which challenges gender roles or features gender bending or transgender characters may itself be referred to as a "gender bender."

another way gender bender can be described as is where in a familiar story the genders are swapped so as you can see from the pictures its quite popular to do this with Disney characters