Erich von Rerugen

Erich von Rerugen a.k.a. Lehrgen is a talent military officer serves under the Imperial General Staff Office.

Appearance
In the light novel, he has short, brown, center part hair and blue eyes. He has a quite fit body shape, and the airs of a noble.

In the anime, he has black hair with a long strand of hair that set aside his face. He has a gentle, cool-headed looking face and wears bottom rimmed eyeglasses. He wears his officer attire in casual places and during conference meetings.

Personality
He is knowledgeable, diligent, and thoughtful on his duties. He has extraordinary observations of various departments during the War College conference, and received high evaluations even in the General Staff Office. Hence, he was able to see through Tanya's true nature, and thought of her as monster.

Plot
He first debuts as the merit investigation branch head of manpower department. Later, he was promoted from Major to Lieutenant Colonel due to excellent performance, and was assigned as the executive officer for the General Staff Office’s Operation department, and went to the north front as the inspection. On the train went to the north, he read Zettour's thesis about the World War. He went to many battlefields to carry out the missions General Staff Office gave.

Trivia

 * According to LN Volume 7, Lehrgen Combat Group was picked up by the future historian during 1976 Common Era.
 * His name has various versions from different media. Check Terminologies.