Constellation:

Character:

 He is often called "Mother" by Tamaki and "Shadow King" by the rest of the club. He is behind most of the Host Club schemes and the other club members tend to go along with whatever Kyoya says, sometimes even favoring his leadership over Tamaki's. Despite their opposite personalities, Kyoya and Tamaki have been best friends since their last year of middle school, when Tamaki transferred to Ouran. He is a third son and has spent his whole life honoring his family name and yielding his true abilities so as to not overshadow his brothers.

Source from Wikipeida