Eris Greyrat is a character from the light novel series Mushoku Tensei: Isekai Ittara Honki Dasu, written by Rifujin na Magonote. She is introduced as a noble girl with a strong personality and a fierce attitude. Eris is known for her exceptional combat skills and her ability to wield a sword, making her a formidable fighter in the story. Throughout the series, Eris develops a close relationship with the protagonist, Rudeus Greyrat, as they embark on various adventures together. Her character evolves from a brash and impulsive young girl to a more mature individual, showcasing her growth and the impact of her experiences in the fantasy world.