Neptune is a major demoness from the Solar System in the Milky Way Galaxy. She was first mentioned in Golem in the Gears.
Neptune has the Higgs boson particle field that generates mass and its ambiance is energy. It was introduced as male initially, but it was female in its next appearance. Its named is stylized as NEƛP/TƛUNE.
Novels: Golem in the Gears, Swell Foop, Board Stiff, Five Portraits