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Balloon Boy, abbreviated to BB on the Custom Night screen, is an antagonist in Five Nights at Freddy's 2. He appears in R64: Return to Freddy's Spaghettria and makes a small cameo in SM64 Bloopers: Can the Villager come out to play?.
Balloon Boy first appears on the security camera when Puppet is about to escape the Music Box, alarming Mario of this. He later appears when Bonnie tries to attack Mario, asking if he can go into the office, only to be knocked out by Bonnie. Afterwards, he tries to enter the office, but is blown up by a thrown grenade. Balloon Boy also can be seen selling "butt scratchers" to the other animatronics before being corrupted by Purple Guy, and is last seen when Mario punches him at Purple Guy, knocking both out.
In this blooper, Balloon Boy makes a cameo when the eponymous Villager destroys an carbon dioxide tank in an attempt to kill Mario. This causes Mario to hallucinate, seeing Villager as a happy Balloon Boy in Candy Land. The actual Balloon Boy was also seen being halted by a cop after the cop mistook him for the Villager.
His head was torn off by Mario, it is unknown if he still reappears in some episodes.