Daiko Hayami is a supporting character in the 1994 to 1995 anime series New Cutey Honey. She is the wife of Akakabu Hayami and the mother of their son, Chokkei Hayami, forming part of the new Hayami family central to that continuity.

Regarding her background and personality, Daiko is a career criminal with a pronounced love for theft, showing a particular fondness for pilfering jewelry. She is a respected figure in the underworld, having formerly held the position of the first president of the organization known as the Thug Alliance. Despite her confidence as a thief, she lives with a constant fear of the primary antagonist, Dolmeck, and his gang, a fear significant enough to restrict her criminal activities and limit how often she feels safe leaving her home. In her domestic life, she is shown to be a protective and combative figure, willing to fight anyone who poses a threat to her family. She and her husband allowed the protagonist Honey Kisaragi to stay with them at the request of their son, Chokkei, and the family patriarch, Danbei Hayami.

Daiko possesses notable abilities that complement her chosen profession. As a thief, she is skilled at taking whatever she desires. More distinctively, she exhibits an amazing amount of physical strength, being able to lift large and heavy debris with relative ease.