Plutoian (also known as Plutian) is a non-binary xenogender in the celestial gender system. It is a gender that is filled with the energy of the void. Someone who is plutoian can 1) be void of gender itself, 2) be uncertain of their celestial energy, 3) have no celestial energy, 4) have celestial energy that is like that of a black hole, the absence of all, but still having celestial energy. It is similar to agender, or singularian.
Plutoian 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. The flag is based off the colors of Pluto.