Character profile
Teletha Testarossa
テレサ・テスタロッサTessa
Biography
Teletha "Tessa" Testarossa is the 16-year-old captain of Mithril's TDD-1 Tuatha de Danaan. A charming but sometimes clumsy child prodigy, she has spent much of her life around submarines and military bases. Tessa is an accomplished tactician, one of the submarine's chief designers, and the creator of its artificial intelligence, Dana.
Story spoilers
Tessa is later revealed to be a Whispered. Her mathematical and scientific abilities are surpassed by her brother's, which seems to give her a sense of inferiority.
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