These are largely called the Hitachiin twins, "Small Devils," or "evil doppelgängers" (the final title only employed by Tamaki). Hikaru's rose is pale blue; Kaoru's is orange/coral. When hosting, they exhibit an extreme brotherly love which borders on the incestuous, but which appeals to a significant proportion of their clientele. https://host-club-service-industr34433.smblogsites.com/28721446/the-basic-principles-of-host-club-interaction