Sadako Yamamura is a central character in the Ring series, known for her haunting presence and tragic backstory. In the series, she is the vengeful spirit responsible for the cursed videotape that leads to the mysterious deaths of those who watch it. Sadako's character is deeply intertwined with themes of isolation, revenge, and the supernatural. Her terrifying abilities and unsettling history drive the narrative forward, making her an iconic figure in horror fiction. Her presence raises questions about the consequences of unchecked emotions and the impact of past traumas.