Growing up as an orphaned child soldier in the army who was treated as a mere tool, Violet was not socialized like a regular human being and did not understand human feelings well. She was raised and grew up as a person who had feelings but couldn't perceive or express them. For this reason, she could be mistaken as emotionless. Even before she was found and taken into the army, she couldn't speak or understand speech, only understanding orders to kill. She did not possess any sense of right or wrong from the start; she didn't understand what could be considered righteous or erroneous. She merely chased after the adults who gave her orders. She did anything that was asked of her and always followed orders, which was a trait from her life as a soldier. Even after the war ended and she was discharged from the military, Violet had a habit of using words back from her life as a soldier; saluting, disliking being defenceless, and doing tasks without taking any breaks. She also continued to think of herself as a "tool" and believed that it would be appropriate to discard her if she can no longer be used as a weapon.

Violet is seen to be a persistent, dedicated, and dignified girl, and she is described as someone who is likely to not back away no matter how much others urge her. She has also always been very selfless and determined, which is shown when she refused to leave an injured Gilbert behind, even when she had lost both of her arms.

Violet is also aloof, expressionless and is said to have the attitude and the presence of a doll. Her expressions are mostly deadpan, so it is hard to tell her mood changes. This is why she sometimes has trouble expressing her own feelings and comes off as expressionless, which makes it difficult to get through her, but she will give a smile from time to time. Through her work as a Doll where she helps people write heartfelt letters, she slowly learns about human emotions, leading her to become more skilled at writing letters and conveying her clients' feelings, as well as becoming understanding of others. She is proven to be a good listener and someone who always thinks about other people's happiness.

She also came to value the human life a lot, and she made a pledge to never kill anyone else again since she knows that anyone she kills will never be able to convey their feelings to their families and loved ones again. She never wants to go back to being a tool and deems that she doesn't need anyone's orders to live her life anymore, which was a wish that Gilbert had deeply wished for.