Teletha Testarossa

Teletha "Tessa" Testarossa (テレサ・テスタロッサ, Teresa Tesutarossa) is the commanding officer 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 an American by birth but has lived on submarines and military bases most of her life.