Teletha "Tessa" Testarossa is the clumsy captain and creator of the Tuatha De Danaan submarine and Dana, the sub's Artificial Intelligence. She belongs to Mithril, an Anti-Terrorist private Military organization. She is a U.S. American by birth but has lived on submarines and military bases most of her life. She was born December 24, 1984 and is a child prodigy who achieved the rank Colonel by age of 16. She has silver/platinum hair and gray eyes. Later in the series, Tessa is revealed to be a Whispered. Her high level of mathematical and scientific prowess is dwarfed by her older brother's, which gives her a sense of inferiority. Though not very athletic, she is shown to be a very good swimmer in episode 8 of Full Metal Panic? Fumoffu. Like Sousuke, she hates alcohol, saying that it kills