Rotten Chica is an antagonist in Fredbear and Friends: Left to Rot.
Rotten Chica appears similar to Withered Chica from FNaF 2 but her suit is warped and distorted from age and a damp environment. Her suit is sagging around the joints and is severally torn. Her jaw hangs loose as if it is broken and she is missing both hands.
Rotten Chica is active in Test Room 02 along with Rotten Freddy, Rotten Bonnie and Rotten Foxy. She will roam the facility before attempting to enter the player's office using the right vent. The player must check the camera for her and when she appears in the right vent the ventilation must be shut off on Chica's side to drive her off. Failing to do this in time will result in Chica jumpscaring the player, causing a game over. The ventilation cannot be left off for too long as this causes the toxic percentage to rise and will cause the player to pass out of it reaches 100%.
- Rotten Chica is presumably the same Chica from the Training Tapes but damaged due to age and neglect after Fazbear Entertainment closed it's doors.