Endo will start the night hiding. After some time, he will go to the music box camera and wind it down. You can stop him by using the flashlight on him. Once you use it for about 2 seconds, he will make a run towards your office. If you don't have your mask on when he enters, he will take your mask for the night. He acts like Toy Chica/Bonnie in your office, except he leaves quicker.

If you have any ideas for the shadow characters, drop them in the comments!