Sensitive to spiritual realities people are blind to
Acts 19:15 – recognize levels of spiritual power
Luke 4:41 – multiple demons identified Jesus as the Son of God

Affiliate with themes of death
Matthew 8:28 – live by tombs

Cause the destruction of those they inhabit
Matthew 8:32 – death
Matthew 17:15, Luke 9:39 – self-destructive convulsions
Luke 8:35 – not in their right mind (crazed)
Luke 8:27 – driven into the desert

Enhances or suppresses normal behaviors
Matthew 9:32 – prevent speaking
Matthew 12:22 – prevent seeing
Luke 8:27 – wearing no clothes
Luke 8:29 – un-natural strength

God has authority over them
Mark 3:15 – to cast demons out of mankind
Matthew 8:29 – to dictate their eternal torment