*Madonna is a character who was set to appear in the Sonic the Hedgehog series. She was supposed to be a love interest for Sonic during the early development of the original Sonic the Hedgehog. Like most other early ideas, she was scrapped before the final release.

Madonna's appearance is that of a blonde, short haired, human woman in a form-fitting, red dress. The art design of her hair mirrors the design curves of Sonic's own quills. In comparison to Sonic and Dr. Eggman, her overall height makes the hedgehog appear smaller than how he would later be presented, while her skinny frame opposes the doctor's round body, giving her design a lanky perception.

Naoto Ohshima gave her the same color design as Sonic and Dr. Eggman. She has yellow hair like Sonic's shoe buckles and Dr. Eggman's buttons, a red dress like Sonic's shoes and Dr. Eggman's shirt, blue eyes like Sonic's fur and Dr. Eggman's glasses, and prominent, black eye lashes like Sonic's eyes and nose and Dr. Eggman's black pants. Dr. Eggman did not have these color similarities when he was in the concept stage with Madonna but would immediately use them starting with Sonic the Hedgehog (16-bit), and in the game's promotional materials.

Madonna's main difference from Sonic and Eggman, design-wise, is that she lacks white gloves.*