Lucy Steel is the wife of Steven Steel, the organizer of the Steel Ball Run. Lucy's involvement with the story truly begins when Funny Valentine is introduced. Lucy finds out that Funny Valentine plans to gather the bones of "The Saint" for his own needs and also kill Steven Steel. Lucy goes to great lengths to prevent this from happening.
Later on Lucy tries to help Hot Pants steal back the heart of Jesus' corpse from the president by disguising herself as the president's wife. She is captured by Valentine though and is chosen by the corpse to be it's user, turning her into an artificial Stand user and allows her to use it's "holy field" inducing ability that Valentine plans to use to become the leader of the world.