The main antagonist is John, an entity of pure chaos. I wouldn't even call him a 'villain' in the classic sense, which is what makes 'Malevolent' so unsettling. He's more like a force of nature that latched onto Arthur. He isn't scheming for power or world domination; his goal seems to be the deliberate, prolonged erosion of Arthur's sanity and agency, turning him into a puppet for his own amusement. The horror is in the intimacy of it—this thing is inside his head, commenting on his every fear, twisting his perceptions. It's less a battle for a kingdom and more a horrific, internal siege.
Arthur's struggle isn't to defeat John in a fight, but to somehow coexist without being completely consumed. That dynamic creates a tension that's psychological and constant, rather than building to a single climactic showdown. The real conflict is whether Arthur can retain any shred of himself while sharing his consciousness with his own tormentor. The story frames John not as an external foe to be vanquished, but as a parasitic part of Arthur's own shattered psyche.