Yuuichi Ootori is Kyoya's older brother. He's only seen in the Anime during flashbacks when there's a close up of the family portrait, and is showed sometimes in the Manga. Yuuichi has already graduated at Medical School and works with his father at the same hospital, and as Kyoya defines in the anime, he is the natural heir of Ootori's companies, because he is the eldest son of family. (Source: Ouran Wikia)
The Class President of 1-A, Kazukiyo suffers from nyctophobia and a fear of just about anything else that is scary. He has romantic feelings for Class 1-A's Vice President, Momoka, whom he has known for years, but he is initially too shy to come out and say anything. Hikaru and Kaoru comment that he is the kind of person with pure feelings who they can't tease, possibly because he is more emotionally vulnerable than Tamaki. In the manga, he unwittingly caused Haruhi some problems when he became top of his cohort.
He appeared in episode 6 as the elementary host. Renge categorized him as the naughty type. He resembles Tamaki as a child. Shirou declares that he’s serious about becoming a host - there’s no time left and he needs to learn how to make women happy. But what he really wants is to make Kamishiro Hina happy before she moves away.
Éclair is the beautiful, shrewd heir apparent to the France-based Grand Tonnerre Group, which now employs Tamaki's mother as a servant in Éclair's house. Having heard a great deal about Tamaki from his mother, Éclair develops a kind of crush on him and concocts a scheme to make him her husband. She tracks down Tamaki in Japan and convinces him to leave the Host Club, offering him a chance to see his mother if he complies with her wishes. She secures non-interference from the Ootori group by arranging for the Grand Tonnerre Group to buy up Ootori Medical so as to control Kyouya's father.
The main female character of Karate Bu, she is the manager of the Kangokou Karate Club, and Takagi's love interest. She is extremely loyal to him, so much so that when Takagi left Osaka for Tokyo, she went with him. Takagi has also trained her to fight so she could handle herself if threatened. She once attempted to adorn the Karate Club's uniforms with hearts.
b" He's the father of Hikaru and Kaoru. Works at the software company. He took his wife's family name. "
Reiko is part of the Black Magic Club lead by Umehito Nekozawa. In an extra, it shows that Honey-senpai and Reiko get married.