Suicide Mouse bears a strong resemblance to the Mickey Mouse as first depicted in his early cartoons, as all of his colors are in grayscale, mostly Black N' White, and his features match the original cartoon character: Mickey Mouse, especially when compared to Photo-Negative Mickey and linked similar to Willy. He walks around with his hands tucked behind his back, except for when he is in the Meat Freezer, in which he walks with his arms outstretched.
Suicide Mouse activates on Night 3 normally, When Suicide Mouse starts, the TV in the Broadcasting Room will turn on and Suicidemouse.avi will play. For now, a death animation does not currently exist for Suicide Mouse, but he can crash the player's game and will scream multiple times if he catches the player hiding under the desk.
When Suicide Mouse enters Character Prep 1, the posters on the wall change to an image of his face, similar to the original Mickey Mouse cartoon intro and outro. Suicide Mouse starts in the Broadcasting Room, then heads directly to The Office, rather than walking around the building at random or going back and forth through cameras.
When he enters The Office, the player can normally just shut off a camera to lure him out The Office, hiding under the desk will only have 50/50 chance of making him leave, or the player can shut off the power to make him immediately leave. But if the player fails to do these things in time, Suicide Mouse will attack the player the next time the player puts the monitor down, or if he catches the player hiding under the desk, or if the player shuts off the power in bad timing.