Nightingale 51 is a robot servant built to work in the hospital on Nu-World.  
 
When she was repairing Alex Ultron, he felt sympathy for her and the other robot "slaves" and gave her his arousal hardware. This advanced technology gave her her own sentience. She returned the chip to Alex when his personality was erased. It contained back up hardware which restored his personality.  
 
Now calling herself Gale, she began to recruit and change more robot servants in order to gain their independence. She asked Alex to lead them, but he declined.