Greyrat, Eris Boreas

Greyrat, Eris Boreas appears in 4 anime, including Mushoku Tensei: Isekai Ittara Honki Dasu, Mushoku Tensei: Isekai Ittara Honki Dasu Part 2, Mushoku Tensei: Isekai Ittara Honki Dasu - Eris no Goblin Toubatsu.