Hikaru Hitachiin¹

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Hikaru tends to part his hair on the right, while Karou parts it on the left. Although they tell Tamaki they change it daily, their hair parting is generally consistent, unless they are deliberately trying to confuse others. Both twins have amber eyes, thin faces, and pale skin. In many cases, the older twin stands on the right side, which is Hikaru. When not seen in the typical Ouran Academy uniform, Hikaru prefers to wear flamboyant designer clothes, but he still dresses somewhat differently from Kaoru. His short, somewhat messy hair is depicted as reddish-brown. At one point in the manga, he dyes his hair dark brown to distinguish himself from his twin, Kaoru. In the anime, he is shown dyeing his hair pink to differentiate himself from his twin after a fight, and later changes it to light blue to confuse the female customers at the Host Club (though Haruhi saw through his deception).

Due to his immaturity in dealing with others, Hikaru is childishly possessive of every member of the club. An example of this occurs during Episode 16 – “Operation Haruhi and Hikaru’s First Date!” where Hikaru becomes jealous of Haruhi’s childhood friend, Arai. Haruhi slaps him when he becomes rude, and he runs away with Kaoru chasing after him. Another example of this is in the manga, when Hikaru gets annoyed by Haruhi’s constant talking about Tamaki and her family situation. He runs away once again, with Kaoru following him once again. In the end, it is Kaoru who helps Hikaru understand his romantic feelings for Haruhi despite his own. Hikaru was born under the star sign of Gemini, the Twins. The positive traits of this sign are adaptability, versatility, enthusiasm, eloquence, wit, and intellectualism; the negative traits are inconsistency, superficiality, indecisiveness, lack of concentration, and nervousness. There is speculation as to whether Hikaru and Kaoru each possess all of these traits or whether the traits are divided between them to create a "good" twin and an "evil" twin.

The Hitachiin twins are classified as the "Little Devil" type and, as such, are perceived as mischievous (though not malevolent) troublemakers. Their selling point at the Host Club is their "Forbidden Brotherly Love" package, which has them acting like twins to entertain their female customers. A common game they love to play is the "Which is Hikaru?" game, which involves the twins disguising their hair with identical caps and then asking people to guess which one is Hikaru. Only Haruhi gets it right, and she has logical reasons for doing so. Her ability to see them as unique individuals is one of the reasons they both develop romantic feelings for her, leading the twins to take her out on separate dates.