Sonnian is a non-binary xenogender in the celestial gender system. Is a gender that is both plutoian and juparian. Someone who is sonnian could feel both genders at the same time, feeling a connection to both soft masculine celestial energy as well as a connection to the void. Or they may be fluid between the two. They may feel different amounts of each gender at different times. Sonnian can also be considered the demigender form of juparian.
History
Sonnian 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[1]. The flag is based off the colors of the sun.