So my only thought would be the mask(yes the one used in FNAF 2) and heat and maybe sound.
Mask: From time to time Blob would come into the room and look around. The player will see a large group of wires on the ceiling and have about 2.5 seconds(give or take depending on difficulty) to react by putting the mask on.
Heat: The hotter it gets the more active Blob gets after reaching a certain temperature. This temperature is of course changed depending on difficulty. The higher it gets the more aggressive they get.
Sound: They're supposed to be part of Molten in a way so I'm thinking maybe something simular to Lefty?(Not really sure myself)
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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.