Someone who is genderfluid between (a) nonbinary gender(s) and gendernull.
The static equivalent is Nullenby, the neutral equivalent is Neutranullfluid and the androgynous equivalent is Androgynullfluid.
History
The term Nullenbyfluid 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 yellows represent gendernull and nonbinary genders respectively. The variation of grey and yellow stripes show the gender's fluid nature and the light yellow stripe shows being inbetween or both/all genders.