OSTOGENDER Definition: Ostógender is an umbrella term for a set of xenogenders that feels like a skeleton with a slight aura of a certain gender. This gender was made with skeletonkins in mind but anyone can use these genders. Ostógender is also similar to ghostgender and libragender. Flag creator: Ellipsist (2020) Colour meanings: The yellow block gradient is inspired by the associated with gender neutrality and the white-gray block gradient is inspired by the color of bones.