Nana

Nana is an Operator from Gigantis Island. She is a very advanced Operator, and thus was taken prisoner by Silver Horn to run the security system in Tianna Camp. She was held at the very bottom of the camp, in a dark room below sea level (supposedly at the bottom of the ocean) and locked in a suggestive-looking metal chair at all times. She was kept hostage there, running the functions of the camp until she was rescued by Mega Man X and Spider. After she is rescued she stays at Central Tower with Chief R, though she seems to retain scars from her imprisonment by Silver Horn, and usually appears either frustrated or melancholy.
 * "Na" is Japanese for 7, and so her name is a pun on the 77 on her chestplate.