Witch Regret is a machine part of the Four Shining Stars. She is responsible for defending Edens Zero. Her power, Shield Ether, allows her to produce barriers made of Ether. Witch is very dutiful and holds a deep respect to Ziggy and his adoptive grandson Shiki. Although she is usually emotionless, Witch is capable of showing emotions. She finds it embarrassing to show her face to other people.