Yoko Littner (ヨーコ・リットナー Yōko Rittonā?) is the primary female protagonist of the series. She is a girl from Jeeha’s neighboring village of Littner who had been chasing the Gunmen that crashed into Jeeha Village during the events of Episode 1. She wields an extensive range of firearms, most frequently use of which is a long range sniper rifle modeled after the Barrett M82.
Yoko is shown to be very mature and quite knowledgeable. Despite being a kind and caring person, she can be aggressive sometimes. In addition to being able to handle most situations well, Yoko is known too be very good in both hand-to-hand combat, marksmanship, and a combination of the two. She generally prefers to think things through before charging head-first into a battle and is shown to be a very protective person, and cares deeply for her teammates and friends.
After the defeat of Tepplin, Yoko remains generally the same, but with a new outlook on violence. Having seen friends die, Yoko believes that violence, mostly senseless, is terrible and should be steered as clear as far as possible from the innocent, particularly young children.
Unlike Simon and Kamina, much of Yoko’s background is never revealed. However, what is known is that when Littner Village was filled with gas, Yoko was among them and was forced to flee to the surface.