Rachel Keller is the central protagonist of the horror story The Ring and its sequel. She is an investigative journalist living in Seattle, a working mother raising her young son Aidan, and a former partner of Noah Clay, a video analyst who is also Aidan's father. Her place in the story begins with a family obligation: her sister Ruth asks her to investigate the sudden, unexplained death of her teenage niece Katie, whose official cause of death was recorded as a heart attack despite being a healthy young woman. Following the trail of Katie and her friends, Rachel learns of an urban legend about a cursed videotape that kills anyone who watches it seven days later. Her professional skepticism leads her to track down the tape and watch it herself, after which she receives a phone call warning that she has seven days to live. This event transforms her from an outside investigator into a desperate participant in the curse, and her motivation shifts from solving a mystery to surviving and protecting her son, who also watches the tape.

Rachel is characterized as brave, determined, and relentlessly inquisitive, with a natural skepticism that drives her investigation rather than paralyzing her with fear. Her investigative skills are her primary tool: she traces images in the tape to Moesko Island, uncovers the history of Samara Morgan, an adopted girl with the psychic ability to burn disturbing images into the minds of people, animals, and objects, and pieces together that Samara was killed by her adoptive mother and left in a well, where she survived for seven days before dying. Rachel also discovers the brutal logic of the curse: copying the tape and showing it to someone else is the only way to escape death, a realization that comes too late to save Noah, who is killed by Samara after Rachel unknowingly passes the curse to him. She ultimately survives by accepting this grim moral compromise and helping Aidan pass the curse along as well.

Her relationships define her character arc. The bond with Aidan is the emotional center of her story; she is protective but initially somewhat distracted and emotionally distant, believing things are fine simply because she is not openly fighting with her son. Through the ordeal, she becomes more attuned to his needs and grows into a more attentive mother. Her dynamic with Noah is complicated, marked by their shared history and mutual reliance during the investigation even as former tensions remain. Her relationship with Samara is central as well; Rachel begins by trying to understand Samara's suffering, but by the sequel she must directly oppose her when Samara attempts to possess Aidan, forcing Rachel to take drastic measures. In the second part of the story, six months after the first, Rachel and Aidan have moved to Astoria, Oregon, where she works at a local newspaper. There she faces Samara again, burns the tape, and ultimately enters Samara's monochrome spirit world, seals her back inside the well, and sacrifices herself by falling from a cliff to escape and reunite with her son.

Rachel has no supernatural powers of her own; her notable abilities are her sharp investigative instincts, persistence, analytical thinking, and willingness to confront terrifying situations directly. She is also defined by her moral endurance, making difficult and troubling choices when survival and her son's safety demand them, such as temporarily drowning Aidan to force Samara out of his body. Her development across the story moves her from a flawed, skeptical journalist who keeps others at arm's length to a mother who recognizes her own shortcomings, understands what her child truly needs, and is willing to risk everything to give it to him.