Berta Kästner

Berta Kästner, known as 009-4, is one of the prominent cyborg agents shown in the 009-1 series. She is part of the Nine Number Group, and exclusive to the anime adaptation. She is modeled after Albert Heinrich/004 from Cyborg 009. Berta is a specialized combat cyborg and "human weapon", with built-in firearms and ammunition stored throughout her body. Her backstory was briefly detailed in the extra booklet that came with the sixth DVD release in Japan. Berta was a child of poor immigrants, but rose to greatness in becoming a highly-active athlete. However, she was soon seriously injured in a traffic accident. The Zero Zero Organization offered to reconstruct her limbs with cybernetic surgery, with the condition that she join them as one of their intelligence agents.