A demon, currently in the body of a young woman with dark hair and eyes. She likes French fries and drives a yellow Mustang. She was once a human: a witch who sold her soul, back in approximately the 1500s. Her motivations are a bit unclear, though it may be she’s acting simply because she loves Sam. Lilith hates her.

On rewatching ”Mallus Malfectorum”, Ruby’s motivation is that she remembers being human, which other Demons do not. (Why? She doesn’t know.)