Definitely among the smallest V-Beasts, V-006 is a very tiny "jelly-wisp" as most members of the Foundation like calling it. It is light yellow, about half a foot in height, and its entire body is semisolid and has a jelly-like consistency, save for its esophagus and stomach, which are also inexplicably its only organs.
It feeds on blood. It does so by clinging onto any living being and draining it via a hollow tongue not unlike a hypodermic needle. However, it needs very little blood to survive, and it has no side effects so it is harmless.
It will become familiar with a song if it is played to it enough, and it can whistle along with the song if it's played to it.