Marsean is a non-binary xenogender in the celestial gender system. Is a gender that is plutoian, juparian, and mercurian. Someone who is marsean could feel all genders at the same time, feeling a connection to soft masculine energy, soft gendered energy, as well as a connection to the void. Or they may be fluid between them. They may feel different amounts of each gender at different times. Marsean can also be considered the demigender form of neptunian.
Marsean was not one of the original genders included in the celestial system. It was added in a rework of the system by Tumbr user System-Lgbt, in October of 2018.