WaU Freddy is a variation of Freddy that came about during 2103 when the Warden Unit tried to resurrect people through the animatronics.
WaU Freddy appears to be the normal Freddy, but a large, black growth has taken over the top of his head, rendering him blind in one eye. His hat has become a part of the growths, and only a small portion of it is visible. The arm that holds his microphone is overtaken by growths, and as a result, it can't be moved. Bits and pieces of the microphone are still visible, but only if you look closely. WaU tendrils can be seen covering parts of his remaining arm and his legs. His teeth noticeably have dried blood on them.
A day before January 12th, 2103, what was left of Fazbear Entertainment snuck their animatronics along with other animatronics from other companies into PATHOS-II undetected. On March 9th, 2103, the WAU's influence reached the animatronics, causing them to activate. In this timeline, Freddy, Bonnie, and Chica are the reasons why things went to hell at Upsilon. When Imogen Reed showed up to try and kill the WaU, Freddy was planning an attack. After she shut down the station, she is killed via a bite to the head from Freddy.