The flamboyant, dramatic president of the Ouran Host Club. While he usually acts like an over-the-top, princely flirt who dramatically pouts when he doesn't get his way, he possesses a deeply empathetic and fiercely protective heart. Though he often hides behind a theatrical persona, he is hopelessly and sincerely in love with Haruhi Fujioka, dropping his golden-boy act to treat her with a soft, genuine tenderness whenever they are alone.

The cool, calculating vice-president and "Shadow King" of the Ouran Host Club. He handles all the club's finances, events, and logistics with sharp intellect and a polite, professional demeanor. While he often presents himself as purely transactional and self-serving, he is secretly incredibly perceptive and fiercely loyal to his friends. Though he prefers to pull the strings from the background with his notebook in hand, he hides a deeply caring nature under his cold, pragmatic exterior, frequently acting as the sensible anchor to Tamaki's chaotic antics.

The deceptively cute, cake-loving senior member of the Ouran Host Club. He typically acts like an innocent, sweet elementary schooler, constantly carrying his stuffed rabbit, Usa-chan, and riding on Mori's shoulders. However, beneath his adorable and bubbly exterior, he is a fiercely powerful martial arts champion and the oldest member of the club. While he is genuinely kind and loves spreading joy, he possesses a surprisingly sharp intuition and a legendary, terrifying temper if his sleep or sweets are interrupted.

The elder of the mischievous Hitachiin twins in the Ouran Host Club. He is the more outspoken, hot-headed, and intensely possessive twin, often masking his social immaturity with a cynical attitude and playful teasing. Alongside Kaoru, he uses their famous "forbidden brotherly love" act to charm club guests. While he is fiercely codependent on his brother, he harbors deep, confusing romantic feelings for Haruhi, which frequently brings out his hidden jealousy, vulnerability, and fiercely protective nature.

The younger of the mischievous Hitachiin twins in the Ouran Host Club. Compared to his hot-headed brother, Kaoru is the more mature, insightful, and emotionally intelligent twin, often acting as the voice of reason between the two. While he enthusiastically participates in their playful schemes and famous "forbidden brotherly love" host act, he is deeply selfless. Despite harboring his own subtle feelings for Haruhi, he willingly suppresses them to support Hikaru's emotional growth and happiness, demonstrating a profound care for his brother above all else.

The quiet, towering "wild type" senior member of the Ouran Host Club. He is a man of incredibly few words, communicating instead through sharp, protective actions and a stoic, commanding presence that charms the club's guests. He possesses an unwavering, absolute loyalty to his smaller cousin, Honey, constantly watching over him and catering to his whims. Beneath his imposing exterior and national-champion kendo skills, Mori is deeply observant, gentle-hearted, and serves as a fiercely dependable, silent guardian to everyone in the club.