Rokurokubi Physiology

User either is or is capable of transforming into a rokurokubi. One of many yokai in japanese folklore. Their biggest feature being their extendable neck which can stretch indefinetly. Their name coming from Rokuro(Potters wheel) and Kubi(Neck)

There are two kinds of Rokurokubi. One whoms neck extends and another who's head completely detaches and float around called NukeKubi(Nuke meaning missing)