About

Hikaru Hitachiin is one of the Host club members in the Ouran High School Host Club series. He and his twin brother, Kaoru Hitachiin, are introduced when Haruhi Fujioka stumbles upon the host club. Hikaru is in class 1A along with his brother and Haruhi, making him (and his brother) major rivals for Haruhi's time. The customers at the host club that request Hikaru and Kaoru appear to like the "brotherly love" or "twincest" that they pretend to have. Also a common game to be played at the host club is the "Which one is Hikaru?" game.

Hikaru's uniform is a periwinkle blazer, white shirt, black pants, and a black tie with a purple stripe (the typical Ouran uniform). He has short, auburn, and somewhat messy hair (in the anime it's red/orange and quite spiky), though he dyed his hair dark ash (in chapter 53 of the manga) to make it easier to tell the difference between him and his twin brother, Kaoru. He has dyed it pink before, as well (and blue the next to confuse the Host Club customers). Hikaru parts in his hair on the right, so it looks parted on the left when you're facing him (Kaoru's is the opposite), and although they mention that they switch parts every day, the parting is consistent unless they are purposely trying to confuse people (which has definitely happened before). He has topaz eyes, making him look somewhat like a devil, which is fitting since he is the "little devil" type of host, together with Kaoru. His face is thin and he has pale skin.

Both Hikaru and Kaoru are mischievous and playful, but Hikaru is the more boisterous one, as well as being selfish, stubborn, and immature. Even when separated from Kaoru, he acts basically the same Haruhi states this in the show, though because he no longer has his brother to occupy him, he can become rather destructive. Hikaru is rather childish, and doesn't know how to interact with other people besides his brother since they both spent so long shutting out the rest of the world.

Hikaru and Kaoru were born as twins and spent all of their time together, only recently learning to open up and become friends with other people. Their mother is a wealthy fashion designer, whom both of them seem to take after in appearance, and have grown up to be much like her in personality and fashion skills as well. Their father on the other hand manages a computer software company and doesn't seem to resemble them at all. Mr. Hitachiin is refered to as a "ghost" because he is often not noticed and doesn't interact much with his sons and he is also very quiet. As a child Hikaru grew up never being apart from his brother and they both became very codependent on each other. All through grade school he and his brother refused to accept anyone into their "world" if they couldn't tell the two twins apart as it upset them that no one could honestly do so. They kept to themselves until Tamaki asked them to help him create the host club, though at first they refused, but eventually joined after Tamaki tried relentlessly to tell the two apart. Hikaru is now friends with everyone in the club, and is very protective of them. He seems to be easily upset by being reminded of his somewhat secluded childhood (other than being with his brother) and throws his emotions at people insensitively, since he is so used to being with just his brother. Like in the episode Operation Haruhi and Hikaru's first date he gets slapped by Haruhi, when being rude to her old friend, and he yells at her leading to him running to his room and Kaoru following him to see if he was alright.

Hikaru has a younger identical twin named Kaoru. A game the twins usually play with their customers consist of them using identical caps to hide their hair (since their hairstyle reveal which one is Hikaru and which one is Kaoru) and "shuffling" before then asking the costumers, "Which one of us is Hikaru?"
In episode five, it is revealed that fighting or arguing works just as well, as when ever the two start arguing their clients squeal with delight.

His mother is a famous fashion designer with her own company. Both twins seem to take after her in many ways, including their fashion skills, their appearance and their personality (although they jokingly said once that they fear for their future since they're shy like their father). She also has the tendency of confusing them, at first they minded that but later on they let her call them whatever she wanted knowing that no matter how many times they told her who was who she would never recognize them. In the manga it was revealed she does recognize them but keeps pretending to not do so as a personal game.

His father runs a computer software company. He seems to be more down-to-earth than his wife and children and is often hidden in the shadows, being completely invisible to everyone else around him, even his own family; apparently the same happens with his father-in-law who is always hidden in the shadows near his wife but never seen. Haruhi even mistook him for Mrs. Hitachiin's escort. He is one of the few people who can tell which twin is which even with them having their back to him. He gives advice to his children when he sees it necessary and it shows he cares about the twins feelings more than he lets on.

His grandmother is also a designer but she works on flower designs to the point of her own hair-do being full of flowers in an elegant and quite curious design, reason for Hikaru and Kaoru making fun of her sometimes. As kids they tried to make their own design, drawing a flower design of their own which their grandmother said she would use it as toilet paper (her rudeness causing the twins to think of her as a witch who doesn't know how to be nice to people), nowadays -10 years later- she still keeps the drawing with her and watching an amazing real flower design made by the twins she says they are very talented. She also drives around in a motorcycle.

Kaoru and Hikaru also have a very young little sister who is devilish and slightly rude such as they were when they were children. Hikaru eventually becomes a videogame designer like his father and makes games for her, but she thinks that they are 'stupid'. Her name is Ageha. She also has an adoration for Tamaki and also calls him Milord like her brothers.