Suicide Mouse is one of the suits that starts to come on Night 1, and one of the two Quaternary and the cartoonist antagonist in Five Nights at Treasure Island. Alongside Willy, He is Mickey Mouse from the 1930's.
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.
Suicide Mouse's music will stop the phone call from Greg.
When he enters the Office, the only way to get rid of him is to hide under the desk. If the player manages to succeed, Suicide Mouse will scream at the player and then leave. However, he will not appear again for the rest of the night. His song will also not play for the rest of the night.
The pose Suicide Mouse uses when he enters the Meat Freezer is a reference to the suicidemouse.avi mock-up video where Suicide Mouse walks with his hands outstretched.
If the player manages to survive in-game for a long amount of time, Suicide Mouse's full song will play, revealing that it will play the same moaning and screaming from the suicidemouse.avi video in-game. This can be seen in this video.
The promo for Suicide Mouse isn't made for the moment.
Suicide Mouse cannot kill the player in the Remastered demo.
Although Suicide Mouse is grayscale in game, when his teaser is brightened he is revealed to have red shorts and yellow shoes.
However, if the blend file for his teaser is viewed, it reveals that he is actually grayscale and that it is just the lighting.
Suicidemouse.avi — This story's main focus also introduces the origin of Suicide Mouse.