Photo Negative Suicide Mouse is a fan made character in FNATI 4 FANMADE which is a fake game.
PNNSM looks like his original self but just in a photo negative color.
PNNSM actually has the same behavior as Photo Negative Mickey. If PNNSM enters the office you have to hide under the desk or else he will kill you. If PNM and PNNSM both enter the office you must shut off a cam and hide quickly before they get you. If you hide in the desk then PNM will kill you but not PNNSM.
There is really nothing to ask about