Bronya Zaychik was a Russian orphan who was raised as an assassin since she was young due to the aftermath of the 2nd Honkai War. Bronya is emotionally stunted as a result of Project X-10, speaking in a deadpan tone with a matching expression. Bronya rarely shows empathy or acts in accordance with others. She refers to herself in the third person as "The Bronya" and often refers to others as "subject", with the only exceptions being Seele and Mei.