The Liar is a rather strange Dying Man piece that debuted in the creepypasta "Nothing But Lies Here". It mainly possesses servants of other Fears, mostly Proxies and Timberwolves, but does not truly take control of them. It prefers to hide inside of them, subtly manipulating their thoughts to get them to do what it wants. This makes it very difficult to identify a host of The Liar, with some hosts being completely unaware they have been possessed.
The Liar's sense of self started to be messed with after it possessed a number of female bodies for long periods of time, causing it to change its gender identity. It even became benevolent to a certain degree after it possessed May in The World Through These Eyeholes, which also set the spark of its obsession for The Faceless Bastard.