Originally a salaryman who was murdered in , he was reborn as a girl living in an alternate version of Europe during the late Interwar period. At just nine years of age, Tanya enters the Empire 's Mages troops and is promoted to Second Lieutenant. Her talents, strategies, efficiency, and ruthlessness make her a useful asset for the Empire and a threat on the battlefield.
Since she graduated from the War College as one of the twelve knights, she's been granted the title of von. Tanya defines the man who she reincarnated from as a Japanese man with good physique, tall enough to be an imposing figure in contrast to her current, younger body.
In her current incarnation, the Light Novel describes Tanya as a little girl with a very petite build for her age that could be mistaken to be even younger. She has blonde hair and her eyes are a cold blue. She has a fairy-like face, which looks ill when coupled with her pale complexion. Visha described her face as beautiful and doll-like, but giving off a vampire-like impression because of her sharp eyes. She dresses in an officer uniform and is noted for tying her hair messily and wearing a peaked cap that is a bit too big for her.
The Manga character design of the salaryman followed this description, showing the salaryman as a broad-shouldered and tall man. He has black hair that is combed back neatly, rectangular glasses, and sharp eyes. He is dressed in a typical salaryman set of suit and tie, but with the addition of a long dark coat. Her hair in coloured pages is more of a vivid shade of blond and curlier on the tip, Tanya's blue eyes have a tint of purple, and her skin tone is also noticeably very pale in comparison to Visha.
Tanya wears her officer uniform most of the time, and notably since the Dacian War ended, her uniform has the addition of elaborate looking aiguillettes on her right shoulder. Her combat uniform consists of a duffle coat, helmet, goggles and boots in the Rhine, and she also wore additional fur collared coat during the Norden arc.
