Phantom BB

Phantom BB is

Physical Appearance
Phantom BB has a similar model as BB from the second game, but he lacks eyes. He instead has small, glowing, white pupils similar to Springtrap and the other phantoms and is missing both his "Balloons!" sign and balloon.

Appearances
Phantom BB will sometimes appear in any camera and block its view however, he won't appear in any of vent CAMs. The most frequent cameras that he appears at are CAM 07, CAM 09 and CAM 10. If the player does not switch cameras or lower the monitor, Phantom Balloon Boy will appear in front of the player in the office and jumpscare the player as soon as the monitor is forced to be lowered.

He can disable the ventilation system, causing an error to appear and noise within the office to alert Springtrap where the night-guard is. This will also cause the effect of temporary blindness for the player, since the character in-game is heard heavily breathing and slowly blinking, making it more likely for Springtrap to enter the office and jump-scare the player (this can also happen with other phantoms too).

Phantom BB is one of the 6 phantom animatronics in the game, also making a comeback in FNaF: HELP WANTED for the PlayStation 4 VR, and the Oculus Quest.