Neena Hagen (ネーナ・ハーゲン) is a test tube baby like Rudolf Hagen where it is unknown if she is the blood sister of Rudolf. Nevertheless, she respects and loves Rudolf dearly to a level beyond siblings that she dislikes Aika Sumeragi for "seducing" her brother. A sadistic character and unstable mood, she walks around in her bare essentials and makes sure the Black Delmo girls are punished for their failure.