Cassius is a character from Granblue Fantasy, known as an artificial lifeform created through advanced alchemy and research. He is calm, analytical, and often speaks in a precise, detached manner, reflecting his origins as a manufactured being rather than a naturally born human. In the story, Cassius plays a significant supporting role, often connected to scientific experimentation, identity, and the consequences of creation. His presence adds a thoughtful, sometimes tragic dimension to the series, as he struggles with purpose, humanity, and his place among others.