Name: Kyoya Otori
Nickname: Shadow King
Gender: Male
Age: 17
Birthday: November 21
Nationality: Japanese
Favorite Food: anything spicy
Kyoya is the third son in his family, meaning he is neither an heir nor next in line. However, he has commented that "It's an exciting game", and plans to outshine his brothers when the moment is right.
Ootori Family Staff
Honda, Tachibana and Aijima are the three member staff that guards him. They also make sure that nothing untoward happens to their young master's friends.
Yoshio Ootori
Yoshio Ootori, Kyoya's father, is the patriarch of the Ootori family. Yoshio is portrayed as a cold, calculating father. Kyoya tries hard to please him in order to become heir of the family, despite the fact that his father is apparently a cold and uncompromising man, who shows no understanding for his children and has planned out the lives of his sons as his own successors already (it's unknown what he wants Fuyumi to be, though).
In the manga, he acknowledges Kyoya as a possible successor despite being the third son. In the anime, he states he had already decided Kyoya would inherit Ootori Medical from him (in the manga he states it is a possibility), only to have his third son buy it and return it to his control without ever revealing his identity. He wants Kyoya to marry Haruhi in the anime. He is also the business partner of Renge's father.
Fuyumi Ootori
Fuyumi Ootori is Kyoya's older sister. In the anime, she appears during Kyoya's flashbacks about his first meeting with Tamaki. She clearly cares for her younger brother and tries to help him in life; apparently she is somewhat lacking in the areas of housework and organization, but she appears to be a kind-hearted person. It is revealed in the manga that she was married, but returned home later (for a short visit, which her father chided her for). Her husband's surname is Shido. She and Tamaki are pursuing a tour of commoners' food together.
Yuuichi Ootori
Yuuichi Ootori is Kyoya's older brother. He's only seen in the Anime during flashbacks when there's a close up of the family portrait, and is showed sometimes in the Manga. Yuuichi has already graduated at Medical School and works with his father at the same hospital, and, as Kyoya defines in the anime, he is the natural heir of Ootori's companys, because he is the elder male of family.
Akito Ootori
Akito Ootori is the second son of Yoshio Ootori. He's only seen in the Anime during flashbacks when there's a close up of the family portrait, but does make a quite important participation in the Manga. It's shown that Akito is an undergraduate in Medical School and wants an MBA after leaving college to help his elder brother with the family business; it seems that he doesn't have the ambition to compete against his older brother, Yuuichi, to inherit the Ootori's company and doesn't want Kyoya to compete against Yuuichi either.