Esdeath was a tall, beautiful and slender woman with long light blue hair and blue eyes. She wore a General’s apparel with long sleeves, a blue scarf on her neck, and high-heeled boots. She also has a tattoo on her chest, which is the sign of her Teigu.
In the anime, Esdeath was shown to have a porcelain color skin (most likely due to the cold climate of her home village). Along with that, her breasts were exaggeratedly bigger than her manga counterpart.
Esdeath was a sadist who lacked empathy for people of whom she deemed weak, since she lives by her father’s philosophy (“The strong survive and the weak die”). She enjoyed putting her enemies through great pain, both physically and emotionally. She had no qualms about killing innocent people to get what she wanted, and rationalized her behavior with her father’s old creed. Esdeath was known to treat her subordinates well, letting them do as they please, which in turn inspired their intense loyalty and devotion; this makes her followers the strongest offensive force of the Empire. To her credit, Esdeath has demonstrated genuine care for her subordinates – the Three Beasts and Jaegers in particular – and unhesitatingly authorized them to kill Tatsumi should he ever endanger their lives.
Esdeath loved to fight and held special respect for strong opponents, which shows when she openly recognized Susanoo as a warrior rather than a simple Teigu. Her love of battle has occasionally inspired her to take actions that would incite more hatred against the empire, in the hopes of being able to put down more rebellions. She has even stated that should the empire fall, she would simply start a war herself to satisfy her need for bloodshed.
Despite her reputation, Esdeath possessed great charisma, able to inspire many to fight for her. Even Run, who expected her to be a scumbag, softened his stance on her, despite his otherwise apprehension towards her sadism.
Although she was unabashedly bloodthirsty, she kept it from dominating her judgment. If she were to see that the battle is too much for her soldiers, she orders a retreat and doesn’t risk heavy losses. While she will torture subordinates who fail, she can be forgiving to failed servitors, provided that they aren’t complete failures, and gives them the benefit of the doubt if the failure wasn’t their fault. However, during the final battle against the Revolutionary Army and the remaining Night Raid members it becomes clear that beneath that charismatic military officer is a person of pure evil and bloodlust. This is proven when she used her real trump card to cover the Empire in a Russian Winter. Najenda noted that such a technique put Esdeath’s subordinates, as well as their families, at risk. Her response of not caring, and once again rationalizing it with her belief of social darwinism, showed her cruelty and depravity.
Interestingly, in spite of this pure monstrosity, prior to the final battle, Esdeath spoke of dedicating the battle in the fallen Jaegers group’s memory- even more significant with her initial casual dismal upon Seryu Ubiquitous‘s demise, internally admitted to missing them greatly and envisions the entire group in her memory. This demonstrates that while she would put her men and their families at risk, she does fondly recall those who were more significant than a lackey and having them valued in high regard; especially, in comparison to the Three Beasts.