He can appear randomly when you move to the left side of the office. Afterwards he jumpscares you, and glitches the ventilation, forcing you to restart it.
In order to not get jumpscared by him, always move slowly to the left in the office, if you see him, move to the right, put on the camera, and put it down. It will make him dissapear.
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Five Nights At Freddys 1, 2 and 3 Characters Guide!
De TodoA guide to all the characters in FNAF 1, 2 and 3! hopefully this will help you understand them and what they do a bit more than you did earlier!