The main theme of the Violet Evergarden light novel is the exploration of human emotions, particularly love. Violet, a former soldier, is in a quest to understand what love truly means. In the process of writing letters for different people with different stories of love, she evolves. The light novel also delves into the idea of healing and moving forward from past traumas. Violet's own past as a weapon in the war is something she has to come to terms with while learning about love. It's about how she, and the people around her whose stories she writes, deal with love, loss, and the hope for a better future.
Well, it mainly focuses on Violet's journey. As she was once a tool in the war, now she has to find her place in the post - war world. Love is a central theme. By writing letters which are full of people's various emotions like love, longing, and regret, she starts to feel and understand emotions herself, especially love which was so alien to her before.