Someone who is genderfluid between (a) xenogender(s) and gendernull, under label Nullenbyfluid.
The static equivalent is Xenull.
History
The term Xenullfluid was coined by tumblr user nonbiarrow on 09/05/2021, as well as its flag.[1]
Flag
The flag shows five stripes: the greys and indigoes show gendernullness and xenogender(s) respectively. The varying greys and indigoes show the gender's fluid nature. The light indigo represents being inbetween or both/all genders.