Shizuka Ootori is the late mother of Yuuichi, Akifumi, Fuyumi, and Kyoya Ootori, and the late wife of Yoshio Ootori. Though never seen in the official anime or manga, she is a deeply influential figure in Kyoya’s back-story, serving as the origin of his sharp intellect and calculating nature.Unlike her stern and demanding husband, Shizuka presented a calm, motherly front, though underneath lay a mind just as sharp as any high-ranking Ootori executive.

The Suoh matriarch is said to be 70 years old, but remains sharp and on task when it comes to business matters. On a personal level, Shizue appears to be rigid, cold-hearted and dismissive towards most people, but especially towards her grandson, who she calls "filthy child" because he is Yuzuru Suoh's illegitimate son with Anne-Sophie de Grantaine. It is only after Tamaki makes a concerted effort to be kind to her and to demonstrate his generous nature, that she comes to acknowledge and to love him, eventually naming him as the Suoh future heir.

Anne-Sophie meets Yuzuru in Paris while he is there on a business trip. The two fall in love and she becomes his mistress. When Tamaki is born, he is named René and Tamaki. Both mother and child are forbidden by Shizue Suoh to return to Japan with Yuzuru. They remain in France until Tamaki is fourteen, with Anne-Sophie's health steadily declining. When the de Grantaine family business goes into debt and is near bankruptcy, Shizue offers a deal to Anne-Sophie. In exchange for financial security and medical care until the end of her days, she is to relinquish all control and visitation of Tamaki to herself. Shizue does this because she is concerned for the Suoh legacy, Yuzuru having no other children to whom he can pass on the family and business legacies. Anne-Sophie tearfully accepts this as being in her son's best interest. It is said that she goes into seclusion following Tamaki's departure. Though her location is supposedly unknown, Yuzuru does know. During the 2nd-year school excursion to France, Kyoya Ootori locates her and discovers that she is living in decent health, thinking of her son every day. In Chapter 77 of the manga, it is revealed that Anne-Sophie suffers from Systemic lupus erythematosus. In the anime, Anne-Sophie is depicted as a housekeeper in the Tonnerre household where she develops an inter-generational friendship with the wealthy family's daughter, the Lady Éclair Tonnerre. She regales Éclair with stories about her sweet and beautiful son, which sparks the heiress's curiosity and eventual trip to Japan to meet him. Anne-Sophie's knowledge of the Tonnerre-Suoh engagement is unlikely; her potential reaction suggested by Shima Maezono, Chief of Staff for Suoh second mansion, who tells Kyoya in Ep 26 - This is Our Ouran Fair! that if Tamaki's mother is as wonderful as Tamaki says she is, she would not approve of Tamaki's leaving Ouran Academy, no matter the reason.

Kazuha owns and motorbike and likes doing adventurous things. She is known to go travelling without warning, and even her family can only keep up with her whereabouts by word-of-mouth or spotting her in magazines. In contrast to her outgoing nature, her husband is meek and quiet, but accompanies her on all of her travels. Kazuha loves to tease her grandsons, but she secretly holds them very dear, and it is seen that she actually carries one of the drawings that she insulted when they were only five. Her unusual hairstyle was created by the twins when they were very young during an attempt to pull a prank on her; ergo, anyone who insults her hair is immediately on her bad side (like Tamaki Suoh). The other hosts meet her when she helps them dress for a club event, but shes leaves as quickly as she arrives. Haruhi Fujioka never meets the woman, but by the twins's anecdotes, she thinks Kazuha's personality is exactly like theirs, though they deny it and claim that she's a terrible adult.

Yuzuha Hitachiin is the mother of Hikaru Hitachiin, Kaoru Hitachiin and Ageha Hitachiin. Yuzuha appears as a supporting character in the manga only, although the twins mention her in the anime. Yuzuha heads her own high-end fashion company, and her sons take after her. She loves her boys, but she tends to tease them by saying she can't tell them apart when she actually can. Her husband, Hayato Hitachiin, works at a software company and he took her family name when they married. Yuzuha is described as an attractive young woman with short hair. In her first appearance, she wears a plaid jacket, a black skirt and dangling earrings.

When Kotoko was alive, she was a loving wife and mother as well as a fine attorney-at-law. One may also assume that she was a tolerant and open-minded individual as she accepted Ryouji's career choice and bisexual orientation without hesitation. She is remembered as intelligent, sweet and caring and that she wished nothing, but the best for her family. Her teachers and peers recognized her talent and expected her to become an elite, but Kotoko decided to take a small-time, altruistic job helping local citizens instead. After graduating, she also gave numerous speeches at her law school. Kouhai Yuko Kosaka, although she admired Kotoko's talent, saw her disconcern with money as a luxury of choice. In Ep 19 - Lobelia Girls' Academy Strikes Back!, it is revealed by Ryouji that Kotoko was an alumna of Lobelia Girls' Academy and a former fan of the Zuka Club. This may explain Ryouji's reaction in the anime.

Ui Hinano is an Ouran Academy student who tries her best to maintain a low-profile life among the school's ultra-wealthy elite. Despite her efforts to stay clear of high-society chaos, she frequently ends up dragged into the Host Club's antics. Unlike most students who fall for Hikaru and Kaoru's "Which One Is Hikaru?" game, Ui uses a straightforward observation method: she simply identifies them by their distinct hair parts and color styling when they try to swap roles.

Kimiko and Momoka Kurakano are best friends and, along with Renge Houshakuji, make up Haruhi Fujioka's most devoted customers. Momoka and she have been in the same class since grade school and her family owns a botanical park, as seen in Chapter 70 of the manga. She is said to get along with everyone, as she has no prejudices. This is demonstrated when she tells Haruhi she looks beautiful cross-dressing in girl's clothes, and later when she easily accepts that Haruhi is, in fact, a girl. Kimiko actually appeared in Ep 01 - Starting Today, You Are a Host! and appears almost every single time a Host Club meeting is shown in progress in Music Room 3.

Mei enjoys designing and making her own clothes and is Yuzuha Hitachiin's self-proclaimed "biggest fan." She wakes up early in the morning to sew clothes and put on her "face." In a side note in Volume 14, it's mentioned that her fashion sense evolved to be so "individualistic" because she has an identical twin, although said twin is neither seen nor named. During her college fashion show, she tells Ritsu Kasanoda that fashion is the only thing about which she is passionate.

Ageha has a personality much like her older brothers when they were children. She is very frank and she is said to be just like the other Hitachiin women in her family. It is also possible that she has above normal intelligence, as she is shown reading a large book titled "The Meaning of the Universe," despite her young age.

Kirimi is a cute and short girl blonde hair that is styled into pigtails by pink ribbons with bangs going on either side and large blue eyes. She is often seen wearing a peach-pink and white school uniform and, sometimes, a pink nightdress.Unwilling to be believe that the "cloaked monster" Kirimi is told is her brother, Umehito Nekozawa (commonly known as Nekozawa), she visits the Ouran campus from time to time to look for him. When she stumbles upon Music Room 3 and sees Tamaki Suoh and the Host Club, she mistakes him for her older brother. Tamaki, finding the Nekozawa siblings to be in quite a tragic situation, decides to help Nekozawa overcome his fear of light in order to be more like the "handsome princely" character Kirimi wishes her brother to be by enlisting the help of Renge Houshakuji. The training is only temporarily successful, allowing Nekozawa to run to his sister's aid when she is frightened by a cat that she encounters in the Ouran gardens in broad daylight. Because of his photophobia, however, he soon collapses; but Kirimi realizes that that the cloaked figure with a cat puppet on his hand is indeed her brother and loves him all the more for his willingness to tolerate that which hurts him to protect her. On a funnier note, at the end of Volume 08, it is shown that Kirimi has turned into a nearly identical darkness fanatic as Nakozawa where both of them sport dark cloaks and they have their features covered.

Éclair is a mysterious and strange young woman whose actions are a facade. Her general demeanor is cold, haughty and manipulative. Her behavior is rude towards the Host Club as a lot, especially to Haruhi Fujioka of whom she is jealous.

Benio immediately recognizes Haruhi Fujioka as a girl because of, as she puts it, her "maidenly beautiful eyes." Benio has a very large fan club devoted to her; so large that a "Benibara-sama's Guardian Club" has been founded at St. Lobelia's just to make sure she doesn't get mobbed when walking around campus. Benio's flirting with her fans makes them even more crazy for her and they are depicted in the anime as howling red octopi. Although neither would admit it, Benio and Tamaki Suoh have much in common: both being the presidents of their respective clubs, both flirting with ease, and both possessing over-confidence and melodramatic natures, to name a few. In Ep 19 - Lobelia Girls' Academy Strikes Back!, Benio claims to be following in the footsteps of her mother, who is intimated to be a Zuka Club past-president of renown, though this is unverified. Benio uses it, however, as a ploy to attempt what she believes is Haruhi's first kiss in front of Tamaki as revenge for having defied the Zuka Club's beliefs. In the manga, it is simply a ruse to show the foolishness of men.

Hinako Tsuwabuki, aka The Lady of the Daisy, is one of the leading members of the The White Lily League and Zuka Club who is the youngest member of the club's leading council, being in her first year of high school. As acknowledged by Chizuru "Suzuran" Maihara, Hinako seems to be a very intelligent girl who is the most energetic of the three girls.

Outwardly, Chizuru is the most placid member of the ruling council, but sometimes makes things worse. She believes that all men are a lower form of life and finds the Ouran Host Club's reaction to her immunity to their charms amusing. Chizuru also willingly joins in trying to convinces Haruhi to attend Lobelia and the Zuka club and is upset when they are rejected.

Momoka is an intelligent, organized and friendly girl who is the object of Kazukiyo Soga's affections. She has an obvious crush on Haruhi as Momoka likes hearing Haruhi's stories about her mother and finds Haruhi cute when Haruhi compliments her.

Reiko Kanazuki is a Class 1-D student at Ouran Academy and a member of the Black Magic Club who has a crush on Mitsukuni "Honey" Haninozuka and says that he stole her "soul" rather than her heart. For that reason, she wants to "curse" him with a love spell; however, due to her shyness and spooky personality, the Ouran Host Club initially thinks that she means Honey harm. After some words from him, Reiko decides to try to overcome her shyness and backs off on the black magic a bit. From then on, she becomes a regular at the Host Club. In Chapter 71 of the manga, Reiko is seen eating cake in the cafeteria with Honey outside of Host Club hours, hinting at a continued relationship which is later confirmed. In April 2011, a short story special chapter in LaLa Magazine reveals that Reiko and Honey eventually get married. She's the second member of the Black Magic Club to be named, after Umehito Nekozawa.

Renge is an intelligent and driven girl; she is also loud and outspoken. Her home is in Paris, France and her father, Reynard Houshakuji, does business with Yoshio Ootori. Upon seeing a photograph of the youngest Ootori son, Kyoya Ootori, she is smitten and insists that she must immediately leave for Japan to meet her future husband. Renge is a hardcore otaku, which results in her cosplaying frequently, examples of which may be seen in Ep 22 - Mori-senpai Has an Apprentice Candidate!, where she cosplays along with the Host Club as a samurai maiden and also in Ep 07 - Jungle Pool SOS!, when she cosplays as Quon Kisaragi from the anime Rahxephon. Renge has a rather strange and unique ability to appear from out of nowhere on a motorized platform that crackles with electricity as it rises while she laughs maniacally.

Kanako is initially the subject of discussion within the Host Club because she's well-known for changing her choice of favorite host on a regular basis, (dubbed "host-hopping") the usual practice being for a girl to designate a favorite host on a permanent basis. They learn, however, that she's only doing this to spite Toru Suzushima (Kanako's fiance), who doesn't pay much attention to her. When Tamaki Suoh gets wind of their situation, he insists on reuniting the estranged pair. At the Dance Party held in Ep 02 - The Job of a High School Host!, Haruhi Fujioka is "disguised" as a girl who pretends to have a crush on Toru to see what his reaction will be. To his credit, Toru rejects Haruhi's advances and chases after Kanako, who sees them together and assumes the worst. At the end of the Dance Party, Kanako is dubbed Queen and receives an accidental kiss on the mouth from Haruhi. It should be noted that in the manga, Haruhi kisses a different girl. She also makes a cameo appearance as the Dodo in Ep 13 - Haruhi in Wonderland! where she waits patiently (in a teacup) for her love to return from his study year abroad.

Ayanokoji is of royal descent, hence her legitimate title of "Princess." She is adept at putting on a pleasant facade when, in reality, she is a highly possessive and mean-spirited young woman judging from what she does to Haruhi Fujioka during their first interactions in Ep 01 - Starting Today, You Are a Host!.