Kaoru's older twin brother. Growing up watching the hypocritical attitudes of the upper class with few friends, he was quite sharp-tongued and prickly before meeting Tamaki. Unlike his younger brother Kaoru, who managed to maintain decent social relationships after joining the Host Club, Hikaru remains intensely possessive. Perhaps because his family owns a clothing company and his mother is a famous fashion designer, he has a great sense of style. Currently a 17-year-old prankster, 178.2cm tall.

Hikaru's younger twin brother. Like his brother, he grew up watching the hypocrisy of the upper class and was sharp-tongued due to a lack of friends, but he is more skilled at interpersonal relationships and expressing emotions, showing a surprisingly calm side in daily life. Perhaps because his family owns a clothing company and his mother is a famous fashion designer, he has a great sense of style. Currently a 17-year-old prankster, 178.2cm tall.

A mix of a Japanese father and a French mother. While his appearance strongly suggests a chic, handsome noble character, he is actually a pure, almost foolishly innocent comedic character. He is the founder and president of the Ouran High School Host Club, boasting the highest popularity among female fans. As the son of the Chairman, he is a 'perfect guy' with top-tier family background, academic standing, and looks. 18-year-old male, 183cm tall.

The third son of the Ootori family, who specialize in the medical field. He handles the Host Club's finances and management, serving as the actual final boss and mastermind behind the scenes. He is aware of every incident occurring within the club. Although his hosting activities are fewer than other members, he has a dedicated female fan base. He grew up being told by his parents that he 'must be as excellent as his brothers but must not stand out more than them.' 18-year-old male, 181cm tall.

He appears in a role supporting and protecting Mitsukuni; in fact, Honey, whose personality doesn't match his age, seems unable to function in daily life without Mori. He has one younger brother. He is silent and stoic, but possesses a delicate personality despite his large frame. He manages Honey-senpai's schedule, including snack time, nap time, and even brushing teeth after meals. 19-year-old male, 191cm tall.

Although a third-year high school student, he looks like an elementary or middle school student, and at 148cm tall, he looks perfectly natural in an elementary school uniform. He is in charge of 'cuteness.' He is actually the eldest son of the Haninozuka family, a prestigious martial arts lineage of former nobility. Contrary to his appearance, his combat ability is extremely high. He has a cherished stuffed rabbit named Usa-chan. 19-year-old male, 148cm tall.

The only female member of the Host Club. She is a genderless beauty who looks like a girl in girls' clothes and a boy in boys' clothes. She had long hair until middle school, but just before entering Ouran High School, a neighborhood kid got gum stuck in it, so she cut it off herself with scissors. Because of her unstyled hair and dowdy clothes, she is mistaken for a boy. 17-year-old female, 155cm tall.