Ringer

Ringer, formerly known as Marika before the alien invasion, is one of the novel's main characters and protagonists. She is also the narrator of Parts 1 and 7. A soldier, she is determined and brave, always evaluating the risk before taking action, and she is the best marksman of the group residing at Walker Hotel.

Ringer leaves her group at Walker Hotel as she sets out in search of a new hideout, but when she is followed, she shoots her pursuer who turns out to be her young friend, Teacup. Evaluating the risks as the enemy approaches, Ringer decides against abandoning or killing Teacup.

When Part 7 begins, Ringer has been captured by Vosch who uses Teacup's life as leverage. He orders Dr. Claire to inject Ringer with the 12th System, but she befriends Razor, an enemy recruit who helps her plan her escape. After killing Dr. Claire, Ringer rescues Teacup...