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Kyouya is a second-year student at Ouran High School, and vice-president of the host club. The "cool type" of the club, he is extremely intelligent and quite calculating, capable of manipulating events to serve any number of purposes. His family is primarily involved in hospital management and the medical industry with various other business interests as well, and supplies the school's medical staff and security (via its 100-member private police force). As the third son, Kyouya is unlikely to inherit leadership of the family's business unless he can surpass his older brothers' achievements to his father's satisfaction. This puts a lot of pressure on Kyouya, but he claims that he cannot think of a more interesting challenge. His family and the Suou family are rivals, so Kyouya initially befriended Tamaki because his father ordered him to for business reasons. However, as time passed, their friendship became genuine. Also, in the manga, he's shown to be sympathetic to his elder sister, Fuyumi, who was married; when their father saw her back in the house, he commented that married women shouldn't return home so readily. In the anime, though not in the manga, both Kyouya's and Tamaki's father have an interest in Haruhi, considering Haruhi to be an excellent future wife for their sons. This, they claim, is the only impediment to their being friends like their sons are.
Although Tamaki is the official leader of the club, Kyouya can easily influence Tamaki when he wants, and in a conflict between two of the other members of the club, they follow Kyouya's lead, causing Haruhi to refer to him privately as the "Shadow King." In the anime, he was the only Host Club member to realize immediately that Haruhi was a girl, but kept the knowledge to himself in order to see what would happen; he often goes along with the Host Club's more eccentric antics, or even encourages them further, on the grounds that the results could be "interesting." Kyouya keeps track of various information about the students at Ouran Academy and is even in contact with Haruhi's father, who turns out to be the source from which Kyouya obtained Haruhi's photographs and information about her middle school popularity. He does not hesitate to turn a profit from the Host Club's popularity, even to the point of auctioning off items like Haruhi's pencil, and he keeps Haruhi in debt to the Host Club by finding various ways to add to it.
He claims to do nothing which does not profit him, and tells Haruhi that this is the only reason he is friends with Tamaki and involved with the Host Club, saying that there is "not one millimeter of similarity" between himself and Tamaki. This, however, appears to be a lie. Kyouya is altruistic in his own way, and often seems to act on Tamaki's behalf, most notably during the school festival.
Kyouya has low blood pressure and wakes up with a bad temper, earning him the nickname of "Low Blood Pressure Demon Lord". As such, he tends to sleep in until noon.
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