Dekis has straight, purple hair with bangs that sweep across his forehead, and dark purple eyes set in a pale, angular face. He is tall with long legs and a broad frame. As an esteemed member of the nobility, Dekis is often dressed in high-quality fabrics. Occasionally wears glasses. Dekis is righteous and cares deeply for his sister Medea Solon. Originally the heir of the Solon duchy, he gives up his inheritance and leaves the duchy after realising that they participated in human trafficking.