- Birthday: June 9th (Hikaru is the eldest)
- Zodiac Sign: Gemini
- Height: 178cm (5'10")
- Blood Type: B
- Good at Subjects: Hikaru: Math, Physics, Chemistry, Art / Kaoru: English, Modern Japanese, Art

Freshmen students. Identical twins with a malicious stare, Hikaru (the older one who parts his hair to the right) and Kaoru (who parts his hair to the left) tend to insinuate they have an incestuous relationship to appease their "boys love" fan customers (as well as catering for those fond of the "little devil" types), though they are now very fond of Haruhi, who is also their classmate. Still, they often rub this fact in Tamaki's face and flirt with Haruhi just to provoke him to participate in their games. Their mother specializes in clothing design and there are a few instances where they try to wheedle Haruhi into one of the swimsuits she designed only to be stopped by Tamaki with a yellow parka.

Like Hunny, Hikaru and Kaoru, to some fans, appear to be shockingly similar (that or based off of) to two characters in another work of fiction. The two twins both bear striking resemblences in many things worth mentioning such as personality, humor, hobbies, character, and even, somewhat, in appearance, to those of J.K. Rowling's Harry Potter characters, Fred and George Weasley. Both sets of twins are extremely mischievous and love to cause trouble, also both having red hair and have a habit of speaking in unison. Whether or not Bisco Hatori was influenced by J.K. Rowling is not known at this time, but the simularities between both sets of twins have often led many fans to speculate that Hatori could easily have been inspired by the Harry Potter series, and often have Hikaru and Kaoru's pictures accompanied with the slogan "Double Trouble", a popular Harry Potter song which also is added on many Fred and George Weasley pictures.

Seiyū - Kenichi Suzumura (Hikaru) and Yoshinori Fujita (Kaoru)
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