Originating from *Girls' Frontline*, G43 is a T-Doll modeled after the World War II German Gewehr 43 semi-automatic rifle. She belongs to the G3 firearms family, alongside variants such as the G3A3, G3A4, G33, and PSG1, with her designation directly referencing the historical Gewehr 43.

G43 typically presents a calm and collected demeanor, standing in contrast to more energetic teammates. Despite her serious exterior, she reveals a playful streak, occasionally teasing fellow units. Recognized as a skilled marksman, she is often equipped with a PSG1 sniper rifle.

Within the game's storyline, specifically Chapter 10 Night missions, G43 is recruited by T-Doll MP41 through blackmail. MP41 leverages compromising information to secure G43's cooperation for a mission targeting the Sangvis Ferri ringleader Gager. G43 agrees to participate on the condition that MP41 protects her reputation.

During the operation, G43 provides crucial covering fire alongside StG44, supporting MP41 and Kar98k as they execute an ambush plan against Gager. Despite encountering setbacks, G43 remains a reliable combatant. Her involvement proves vital in exposing Gager's core, enabling Kar98k to deliver the decisive shot.

G43 occasionally incorporates German phrases into her speech, greeting others with "Guten Tag!" and formally introducing herself as "Walther gewehr dreiundvierzehn".