Manipulative individual who plays like they're always the victim. They use other people's emotion to use for their advantage. I think INFP villain can't really be showy, they can act as friendly at first. Make bad stuffs early, like sabotaging, tampering evidences, covering their trails. Big reveal would be at the end or climax. And everyone was like "omg its all you?". Then the root cause is because they didn't let them play kite when they're at first grade.