Ariadne Johnson was an eight-year-old child mentioned in Silent Hill: Downpour.
Ariadne suffered from severe autism, causing her to, sometimes, wander away from home. To compensate for this, her mother tied colored ribbons to street lights so she could navigate back without harm. It is mentioned that Ariadne has an intense aversion towards the color blue.
Sadly, on a normal day while she was walking home from Hillside Middle School, she diverted off her path and went missing, mentioned in a poster. It is later revealed when the player completes the Ribbons sidequest that her mother, quite selfishly, had grown tired of caring for her autistic daughter and devised a scheme deliberately moving the locations of the ribbons to guide Ariadne to the nearby docks, something she writes about in a personal diary-like note. There, Ariadne fell into the water and drowned, a location Murphy Pendleton can find with Ariadne's house keys and a piece of clothing hanging over the dock.