Tsundegender is a Xenogender that feels like a tsundere- cold and unpredictable at first, but once the gender is understood it becomes warm and cozy. It is potentially a Fictigender but doesn’t have to be.
History
Tsundegender was coined by FANDOM user Bunnyisgreat, specifically Fox, as a way to better explain her gender.
Etymology
“Tsundere” comes from a personality type in some Japanese anime and manga. The character starts off as seemingly selfish and cold, but once someone gets to know them, they realize the character is actually quite kind.