Hikaru hitachiin-kaoru hitachiin
The twins Hikaru Hitachiin (常陸院 光, Hitachīn Hikaru?) and Kaoru Hitachiin (常陸院 馨, Hitachīn Kaoru?) are depicted as mischievous, devious and otherwise childish young men who toy with people, including their schoolmates and fellow Host Club member Haruhi. As Hikaru and Kaoru come to better understand Haruhi, they start to care deeply for her, especially after she learns to tell them apart. They were born on June 9, a date chosen by the manga artist to show that they are alike yet different, and are 15 years old at the beginning of the series.