Phone Guy

The phone guy is the one who talks to you in night 1-4. During night 3-4 the phone guy mentions that he feels like the rats are calling to him,then in night 4 he disappears with his last words being "I know what I must do now". He doesn't speak in night 5 due to it is a "bonus" night (nightmare mode). It is unknown if he died or had something to do with the rats