Eris Boreas Greyrat is a character from the light novel series Mushoku Tensei: Isekai Ittara Honki Dasu, written by Rifujin na Magonote. She is a noble from the Boreas family, known for her strong personality and combat skills. Eris has a distinctive appearance, characterized by her long, red hair and green eyes. Initially introduced as a brash and impulsive girl, Eris undergoes significant character development throughout the series. She becomes a key companion to the protagonist, Rudeus Greyrat, and plays an important role in his journey, showcasing her growth and maturity as they face various challenges together.