Background Information: Teletha "Tessa" Testarossa is the clumsy but charming Captain of the revered TDD-1 'Tuatha de Danaan' submarine of the anti-terrorist organization 'Mithril'. She is American by birth but has lived on submarines and military bases for the majority of her life time. She is a child prodigy who rose to such a high rank at the age of only 16, has silver hair and grey eyes. Later revealed as being a Whispered, her high level of mathematical and scientific adeptness is dwarfed only by her brother's, which seems to have given her a sense of inferiority. She is also not very athletically inclined, but has shown to be a very good swimmer. She has an interest in Sousuke that extends beyond a professional one, generating a love triangle she shares with Sousuke Sagara and Kaname Chidori. Even though Chidori and Tessa seem to compete against each other for Sousuke, they are good friends in reality, as during several episodes they talk about Sousuke and his unique military charm. Tessa is also one of the chief designers of the TDD-1 'Tuatha de Danaan', and the creator of Dana, the submarine's Artificial Intelligence. Characteristics: Tessa has a lot of interesting qualities. Her subordinates are what she cares with the most. She is also very smart when it comes to battlefield tactics and conflicts and she displays some very impressive military prowess and strategy at several points. She also seems to have a nervous habit of playing with her ponytail. Sometimes however, as stated by Kurz Weber, "whenever Tessa was told by someone she couldn't do something, she made it a point to prove them wrong". Tessa seems to have some trouble tolerating her job at times due to the position she has. Some scenes have shown her irritated by what she does while other scenes show her slightly depressed by it. Nevertheless, she seems to have a large amount of stamina, and is able to cope with the stress of her tasks, and does a wonderful job doing so. (Source: Wikipedia)
Chidori's humble best friend who brings around her trusty camera. She is constantly trying to bring Chidori and Sagara together, however impossible it may seem given Sagara's tendency to blow things up at whim. However, in the novel 'Continuing On My Own', she was held hostage by Amalgam's agents as bait to lure Sousuke so they could kill him and find Kaname. Kyoko was seriously injured during the rescue attempt and is currently still recovering in the hospital after being rescued by Wraith. (Source: Wikipedia)
Birthday: November 17 Ren Mikihara is the Secretary of Jindai High's Student Council, a friend of Kaname and a daughter of a Yakuza boss. She is an example of Yamato Nadeshiko - Japanese ideal of femininity - and as such, she is beautiful, dependable and caring. She seems to have feelings for Atsunobu Hayashimizu, the Student Council's president. However, much about her is still unknown. Because women in the time of the Tokugawa shogunate were given names with two syllables only (usually adding the prefix "O-" to refer to someone of a higher social standing and considered a honorific), Kaname prefers to address her as "Oren-san."
An obnoxious girl with a hefty appetite, named after Nero Wolfe. She speaks with the masculine term 'boku'. Her Toy allows her to control machines. (Source: Wikipedia)
Richard Mardukas is an overly protective aide of Tessa's who insists on guarding her with his life. He holds the rank of Commander and is in charge of Mithril's TDD-1 when the Captain, Testarossa, is not on board; appropriate, given that Mardukas' position is that of Executive Officer. Mardukas is often seen wearing a hat bearing the name of the HMS Turbulent (S87), a real British submarine. Source: Wikipedia
Kaka was the previous Royal Consort of Hou being the wife of Chuutatsu, and mother of Shoukei. Though Chuutatsu was reviled for his cruelty; Gekkei, the governor of Hou's Kei Province, understood that Chuutatsu's fall was because the king could not see that his harsh laws were hurting his people rather than helping them become upstanding citizens as he had hoped. However, Gekkei's understanding of Kaka is considerably harsher. He knew that while she appeared to be pious and humble before her husband in accordance to his expectations of the ideal citizen should act, she was an extremely extravagant and decadent woman. Though she was aware that her husband's laws were too harsh, she did not reprimand him but instead took advantage of his laws to further her own selfish whims. She ensured her daughter lived in complete comfort and would use her power to secretly eliminate anyone who she perceived as a rival for herself or her daughter. As result, she pressed false charges and ordered the execution of many innocent people. When the king is beheaded, Gekkei finds Kaka in seclusion with Shoukei and Hourin. He personally beheads Kaka for failing to take responsibility for allowing Chuutatsu to inflict great pain upon the citizens of Hou and for taking advantage of her power for her own selfish gain. (Source: The Twelve Kingdoms wikia)
An airheaded detective apprentice whose toy gives her the power of telekinesis. She's always in good spirits and trying to stop her friends from fighting. She's also shown to have an affinity for animals though it is unclear whether they share her feelings.