One of Rasputins Mutants. She has the ability to turn into a wasp. She eventually becomes a ally to Skull Man.
Yuka Kuroki is a doctor, and a mutant. Skull Man first encounters her after her television broadcast about organ transplants. She then encounters a detective named Hioka trying to save his partner who was dying from an unknown poison. He came into her dressing room to talk to her about what happened to his partner. She refused to talk to him but he persists and she transforms into her wasp form and tries to kill him with her wasps. After having every one in the station under her control Skull Man arrives and she tries to take control of him. But he takes the upper hand by disappearing and taunting her. By doing this he is able to enter her mind to find the antidote to her poison. Hearing their Queen in trouble her servants come to help her but Skull Man escapes in time with the antidote.
Yuka has the ability to turn into a mutant Wasp. She also has stingers on her breast. The right one emits a mind control venom, while the left emits a fatal dose of venom. She also can control hordes of wasps. She also has servants with the same ability as her except weaker. It is unknown if she created them or were created like her.