Hikaru and Kaoru are identicle brunette twins from the host club. they look sweet on the outside but tend to purposely cause alot of problems for others, user the main victims. in the host club they pretend to be in a relationship with eachother to get more attention from the customers. 
they are always in sync, no matter what. they finish eachothers sentences and talk in time with eachother and are rarely seen apart.
hikaru is slightly meaner than kaoru and kaoru is nicer than hikaru when alone