Witch Regret is a machine created by the Demon King Ziggy on Planet Granbell to serve aboard the Edens Zero as one of the Four Shining Stars. As the Shield of Edens, her primary function involves defending the ship and its crew. She remained aboard after Ziggy disbanded the original crew, entering sleep mode until Shiki Granbell, Ziggy's adoptive grandson, succeeded as the new Demon King. Physically, Witch is a tall female android with a curvy figure, green eyes, and long braided green hair. She typically wears a visor marked "E4" over her eyes and appears barefoot. Her initial outfit is a black, long-sleeved dress featuring yellow stripes, a deep back cut, and a heart-shaped chest opening exposing cleavage. Later, she adopts a witch's hat during a trip to Mildian, followed by a strapless leotard with purple markings, a cape, gloves, boots, and a horned helmet after the Sun Jewel arc. Her final outfit resembles an extended dress version of the Sun Jewel armor. In deleted memories, she wore glasses and a formal suit instead of her visor. Her personality combines calmness, dutifulness, and deep loyalty to Ziggy and Shiki. She expresses tearful joy at Shiki's succession, panic during crises like the Chronophage's approach to Guilst, grief over Valkyrie's death, and anger toward threats. As a mother figure, she offers comfort, protection, and wisdom to the crew. Yet she displays ruthless judgment toward enemies, violently subduing those attempting to overthrow the Edens Zero. She feels embarrassment without her visor and obeys orders with submissive compliance. Key events include her awakening from stasis after Shiki acquires the Edens Zero. She initiates Protocol A7 when Shiki sits on the Demon King's throne, formally recognizing him as captain. During the Guilst arc, she pilots the ship to rescue Rebecca Bluegarden, explains the Chronophage's time-erasure effects, coordinates with Sister Ivry, and mentors Rebecca on Ether Gear, hinting at her potential as a "Chrono Witch." Her most significant moment occurs during the Aoi Cosmos saga on Nero 66. After recovering from torture by Prince Shura, she activates a full-scale "Protection Matrix" to shield the Edens Zero from the planet's explosion, defying Shiki's order to prioritize her survival. As her body cracks under the strain, she delivers a final speech affirming her pride as the crew's Shield and her love for them as family before disintegrating. A character named Regret, bearing resemblance to Witch, appears in later arcs as a defense attorney and Shiki's biological mother. Their relationship remains unexplored in available information.