Eris Boreas Greyrat (エリス・ボレアス・グレイラット)
She is Rudeus' older cousin and also his student. When Rudeus was around seven years old, he taught her magic along with math and reading. She is a violent, strong and proud girl and merciless towards anyone who holds negative emotions and intentions against Rudeus. (Source: Mushoku Tensei Wikia)
Animeography
Mushoku Tensei: Isekai Ittara Honki Dasu
Mushoku Tensei: Isekai Ittara Honki Dasu Part 2
Mushoku Tensei: Isekai Ittara Honki Dasu - Eris no Goblin Toubatsu
Mangaography
Voice Actors
Lindsay Seidel
English
Ai Kakuma
Japanese
Liza Ohm
German
Amanda Tavares
Portuguese (BR)
Nancy Philippot
French
Rose Mendoza
Spanish