Knox and Kain, twin brothers and potential heirs to the throne, possess contrasting yet formidable qualities. Knox, with his piercing purple eyes and strong sword handling skills, exudes an air of danger and calmness. Kain, with his intense green eyes and hunting prowess, embodies strength and a wild nature. Both brothers share an unwavering obsession and devotion to their younger sister, willing to kneel before her and protect her at any cost.