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Arpeggio el Lalena (アルペジオ・エル・レレーナ)The older stepsister of Lelei la Lelena. She mainly focuses on alchemy and more specifically the study of minerals. This field is quite expensive in her world and receives little funding, causing her to live a life of poverty.
She is extremely jealous of her sister's exploits but deep down has great affection for her, going as far as knitting her new clothes.
(Source: Gate Thus The JSDF Fought Wikia)