Tanya von Degurechaff is the main protagonist of the light novel/anime Youjo Senki: Saga of Tanya the Evil. Originally a salaryman who was murdered in 2013, 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.