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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 tomboy and merciless towards anyone who holds negative emotions and intentions against Rudeus.
(Source: Mushoku Tensei Wikia)