(Not sure how this one'll turn but I'll try to make it good)
So the mini DJ would come from random vents clashing their cymbals together. If the player hears them they must shut the corresponding vent. Can happen as frequently as wanted (depending on level difficulty of course). IF the mini makes it inside the office the player is sent to a minigame similar to the chase scene in FNAF Security Breach or the car game in FNAF Pizzeria Simulator(if car game then there are random lil' DJ's in the way that must be avoid).
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My thoughts of FNAF SB Ultimate Custom Night Possibilities
FanfictionThis is just my thoughts on what SB animatronics that could be in the game could do.