Eris Boreas Greyrat /エリス・ボレアス・グレイラット

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About : 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 Wiki)