Hikaru Hitachiin is a devious and childish first-year student who greatly enjoys toying with his fellow Host Club members Haruhi and Tamaki (whom he often calls, “My Lord”). He and his younger identical twin, Kaoru, are “little devil” type hosts who put on an act of “forbidden brotherly love” to draw in their clients. Unlike Tamaki, the Hitachiin brothers are wholly calculating in their customer relations; however, this is because of their deep dependency of each other, and a reluctance to let anyone into their world. They share a deep emotional bond, which was forged through a lonely childhood and the painful fact that no one could ever tell them apart without looking at the parting of their hair (Hikaru’s hair parts to the left; Kaoru’s parts to the right). Since Haruhi is the first person that can truthfully tell them apart, they greatly treasure her friendship. Haruhi has stated that Hikaru and Kaoru have their differences, despite being identical twins. Of the two, Hikaru is a little more in control of their twincest acts, but is also more childish and immature than Kaoru.