Fmdevvigender is an exclusive gender for alterhumans and non-humans/introjects/spiritual walk-ins in systems. The term is used to describe an alterhuman/headmate that has a complicated gender, due to the world/universe they originated from either having more genders, more ways to descrive gender, and/or a higher likelihood of inhabitants expressing genders that cisgender individuals would likely consider "bizarre".
For example, a fmdevvi-worldgender individual would describe their genders as being like a world due to the fact that in the universe where they're from, being worldgender is the norm and that having a less complicated gender there is less common.
Fmdevvigender individuals can experience gender(s) in any way so long that they believe their gender experience is more common in their home world and/or was influenced by it. They may also be wuywigender, have xenopronouns, or have other experiences that generally cannot be properly described through human language.
History
The term Fmdevvigender was coined by fandom user Bubby Aurora on April 26th, 2021.