Use 1,2,3 and 0 to switch between cameras "this is so you have to be in that camera to lure him there". Use F to use the sound alarms, also you can choice the different positions, uses for the sound alarms, and overall style of the character, "As it's only a concept character with a concept mechanic", Instructions on how to use it "this you could add to the instructions part in the game", Every camera has a alarm use them to lure him to that spot, they have limited uses so uses them wisely, once he enters your door "or whatever the enemies come in through", there's no luring him back.
A character idea for your game. @franziobobik.