Rotten Foxy is an antagonist in Fredbear and Friends: Left to Rot.
Rotten Foxy appears similar to Withered Foxy from FNaF 2 but his suit is warped and distorted from age and a damp environment. His suit is torn away from the thigh down exposing his endoskeleton legs and feet. His lower jaw hangs loose as if broken and his suit is loose around his eyes, displacing the right eye and making the left eye look gaping. Rotten Foxy also appears to be missing his right arm and still retains his metal hook arm, similar to Phantom Foxy from the third game. He appears to have the most amount of damage out of the four rotten animatronics.
Rotten Foxy is active in Test Room 02 along with Rotten Freddy, Rotten Bonnie and Rotten Chica. He will occasionally spawn at the end of the hallway in front of the player's office, which can be seen by his single glowing eye. The player will then need to shut off the power in the office to repel him. Failing to do this in time will cause Foxy to jumpscare the player, resulting in a game over. The player is also susceptible to the other animatronics while the power is off, but this will not cause the toxicity to rise.
- Rotten Foxy's mechanic of standing at the end of the hall is reminiscent of his behavior in FNaF 2.
- Rotten Foxy is the only animatronic during Test Room 02 that is not also seen in the Training Tapes.
- Although he can be seen in the Tragic Ending screen alongside the other animatronics.