A noid is a being that inhabits the world of Underground. The first incarnation of a noids were doodles. Doodles are the bi products of the human's imagination. When doodles are formed, there bodies are constantly in flux and very permeable, so when a doodle comes in contact with the substance INK, which flows naturally there, noids are created. Since noids are doodles with INK making them solid, anything that humans create are therefore, noids. That means that popular cartoon characters such as Bugs Bunny and Micky Mouse are noids moreover, inhabit the Underground.