TV-Series
Description
Erwin is a supporting character known for her deep expertise in European military history. Her real name is either Riko Matsumoto or Satoko Matsumoto, though she is almost exclusively referred to by her chosen nickname, which is a direct reference to the German World War II field marshal Erwin Rommel. She is a 16-year-old second-year student at Ooarai Girls High School and a member of the school's history club, a hobbyist group known as "reki-jo".

In terms of appearance, Erwin has short, spiky blonde hair that is styled to resemble the ears of a fennec fox, an animal associated with Rommel's nickname, the "Desert Fox". Her most distinctive feature is her attire, which she wears even as part of her school uniform. This consists of a dark green field marshal's cap modeled on Rommel's, complete with a pair of captured British anti-gas goggles, and a jacket resembling the tropical uniform of the German Afrika Korps. She stands 158 cm tall.

Erwin's personality is defined by her confidence and decisiveness, often displaying a self-assured, almost cocky smile. However, she is known to remain calm and collected under pressure, only losing her nerve in the most desperate of situations. She possesses a profound respect for historical facts and the military achievements of other nations. This trait is notably demonstrated when she first boards her team's tank; after her comrades criticize its appearance, she passionately defends the vehicle, insisting they show respect for the Finnish soldiers who operated it effectively during the Winter War.

Within the story, Erwin serves as the commander and radio operator of the Hippo Team, which operates a German Sturmgeschütz III assault gun. While the team's nominal leader is Caesar, who attends Ooarai's strategic meetings, Erwin acts as the commander during matches and is often responsible for the team's day-to-day operations. Her deep knowledge of World War II-era tactics and equipment is a significant asset. She is able to analyze battle situations effectively, and her expertise aids her team in devising strategies, compensating for the poor visibility from her vehicle's periscopes.

One of Erwin's most significant relationships is with fellow history enthusiast Yukari Akiyama. The two share a close friendship, often pairing up to perform reconnaissance missions, such as during the match against Pravda. Reflecting their bond, Erwin gives Yukari the soul-name "Guderian," another reference to a famed German military leader. In manga adaptations, Erwin also demonstrates her versatility by temporarily serving as a loader and radio operator on other teams' tanks, such as the Renault B1bis. Her abilities lie primarily in her encyclopedic knowledge of military history, which she applies directly to her team's tactics, and her competence in her dual role as a tank commander and radio operator.
Cast