There's Viktoriya. She has a unique relationship with Tanya. She's brave and her development throughout the story, especially in relation to Tanya, makes her an interesting character. Also, Erich von Rerugen. He represents the more traditional military thinking and his clashes and collaborations with Tanya are quite engaging.
There's Viktoriya Ivanovna Serebryakova. She is an important character who has a relationship with Tanya. She is more of a 'normal' person compared to Tanya in terms of her values and personality.
I don't have enough information to know exactly who Tanya is in this story. She could be a fictional character created for the story, or it could be based on a real person named Tanya.
The 'Tanya the Evil' light novel mainly follows the story of Tanya Degurechaff. She is a young girl in a military setting in an alternate world. Tanya is extremely intelligent and cunning in military strategies. She has to navigate through the complex military and political situations in this world, often facing off against various enemies and rivals. Her actions and decisions drive the story forward as she tries to rise in the military ranks while dealing with the chaos and challenges around her.
It's a military-themed isekai web novel. The story follows Tanya Degurechaff, a salaryman reborn in a fantasy world as a little girl. She has to deal with the military and political situations in this new world while trying to survive and climb the ranks. She's a complex character, often using her wits and ruthlessness to get ahead.