Eyjafjalla is a fictional character from Arknights, known as a young Caster operator with exceptional Originium Arts talent. She is portrayed as gentle, intelligent, and somewhat frail due to her illness, which adds a poignant layer to her story. In the series, she serves as a powerful ranged damage dealer and a symbol of scientific curiosity, resilience, and hope. Her role often emphasizes the human cost of Originium exposure while highlighting her determination to help others despite her condition.