Satan is the main antagonist in the controversial film The Passion of the Christ. He is depicted as a ghostlike genderless spiritual menace unlike the stereotypical image of a two horned red-skinned Devil. Despite his character being masculine in nature, Satan is portrayed by Rosalinda Celentano, a woman.
Despite never directly harming anyone in the film, Satan is implied to be the catalyst behind the chain of brutal tortures and eventual deaths in the film. He uses humans to do his sinister and murderous biddings but he is also seen to use his own army of demons to do his biddings, who have the ability to shapeshift into children.
In the beginning of the film, Satan catches Jesus praying in the Garden of Gethsemane and tries to convince him to not sacrifice himself for humanity's sins as he wants Jesus to fail to carry out God's plan. As Jesus's sweat drops to the ground like blood, a serpent, similar to the serpent in the Garden of Eden which was Satan, crawls out of the Devil, but Jesus crushes the serpent, and Satan disappears.
After Judas betrayed Jesus, presumably under demonic influence, a group of children run to him and begin to torment him. The children later turn out to be ferocious demons and under the presence of Satan, they later drive Judas insane and force him to hang himself. Meanwhile, Jesus is interrogated by Pontius Pilate and is later sent to be whipped and tortured by his centurions. Satan walks in the background and watches sadistically as Jesus was tortured and he is later revealed to be carrying a demonic baby, to mock about how he himself could take care of his children better than God himself. During the torture, Satan is presumed to be one controlling the men torturing Jesus by abusing their free will as he appears at irregular moments. He has probably done the same thing with evil men before Jesus's crucifixion.
However, at the end of the film, Jesus succeeds in sacrificing himself for humanity's sins and at the same moment, Satan is sent back to an isolated and parched area of Hell, where he screams in agonizing defeat.