Diffem is a gender that is like female but is different because of one being from another universe, world, or dimension. This gender is exclusive to alterhumans, system members from another universe, world, or dimension, and anybody else that is or was from another universe, world, or dimension.
It is the feminine equivalent to Bothyr.
The term was coined on August 6th, 2022 by Tumblr user Lightlozabow. 
The name of the gender is a combination of the words different and fem or feminine.
A bothyr flag was created by user Lightlozabow on August 6th, 2022. It uses a triangular design to make it feel more different from the average pride flag. The colors on the left are inspired by the colors of the kingender flag, and the colors on the right draw from colors associated with aliens as well as pink representing femininity.