Saikawa Keigo.

Saikawa Keigo works for Youko Morinomiya as her secretary, butler, and chef; his exact job description is unknown. He also attends to the needs of Ryuuichi and Kotaro.

He has light brown hair parted on the left and dark eyes (which he usually keeps closed). He always wears glasses and a suit. His overall appearance is that of a butler; Kirin once mistook him for one and called him "shitsuji-san." His expression is serious and serene.

A mysterious and serious man with a dry sense of humor, which can sometimes be quite corny and sarcastic, all without batting an eye. He demonstrates great dedication to his work and is good at everything from preparing dinner to carrying out the president's daily orders. However, he sometimes takes things too seriously, such as when he impulsively decided to embark on a trip to perfect his culinary skills after noticing that Kotaro was losing his appetite.

She has a habit of adding -sama (a term of courtesy) to the names of the people she speaks to. She found it difficult to connect with the children at the daycare while Usaida was sick and on leave. But her usual politeness and formality, along with her submissive demeanor, somehow won them over, as the children saw themselves as being "under the command" of an adult.

Whenever Ryuuichi or Kotarou praise his actions, even slightly, he remains humble, stating that he "doesn't deserve such praise," but appreciates their kind words nonetheless. He constantly strives to perfect his skills.

He celebrates every little thing that happens to the Kashima siblings and seems to understand Kotarou's thoughts without him saying a word. He is kind and caring, and considers the Kashima siblings his own family. He also acts as a liaison between the student council president and the siblings, explaining that the president is shy and brusque, but actually very kind and embarrassed by it. He can be very wise and insightful.

However, most of the time he is an enigmatic character with an unknown past and acts very strangely at times (on one occasion, when Usaida went out for a drink with him, the shop owner thought he was a mannequin, and also approached Inui from behind and gave him a handkerchief). [1] He is friendly, open to others, affectionate, mysterious, and eccentric. He possesses superhuman abilities and is capable of anything.

Nothing is known of his past, except that he worked for the president's family for years, even while her son and daughter-in-law were still alive. Apparently, he was a diligent bookworm during his teenage years and lived with his grandmother at some point.

President: He works as her secretary, but he also cooks and cleans. She understands his kindness and how, despite his gruff appearance and straightforward personality, he's actually caring and embarrassed to show his more sensitive side. The President trusts Saikawa's abilities, but she's annoyed by his obvious attempts to get her to express herself more and exasperated by his eccentric behavior.

Kashima Brothers: He gets along well with both of them and respects them as much as he respects the President. He cares for them, and when he feels he has let them down, he will do whatever it takes to make things better (even when he doesn't need to, the only thing that stops him being Ryuuichi's insistence that everything is fine). Even when he is sick, he constantly chooses to "reflect" on how the experience can help him take better care of them. Ryuuichi has noticed that Saikawa has an uncanny ability to understand what Kotarou means, even when the young boy is otherwise incomprehensible.

Usaida: They had a drink together once. While Usaida was sick, he entrusted Saikawa with the care of the children at the daycare. However, Usaida still has no idea about Saikawa's likes and dislikes, or his family history.

Kotarou Kashima
Ryuuichi Kashima
Hayato Kamitani
Taka Kamitani
Takuma Mamizuka
Kazuma Mamizuka
Kirin Kumatsuka
Midori Sawatari
Yoshihito Usaida
Maria Inomata

Age: 2 Years / Nursery Baby.
Ryuuichi Kashima's younger brother.
Kotaro has short, blond hair and a sleepy expression. Occasionally, his eyes sparkle when he gets excited or happy to see his brother or something interesting, like chicks hatching. Like the other children at the daycare, his cheeks flush when he's curious or about to cry.
Kotaro often wears clothes with a small tiger design (referring to his name, which means "tiger"). He's also sometimes seen wearing a panda hoodie, probably because he read Ururun Panda-chan.
At the daycare, Kotaro is often seen quietly reading a book in a corner, or asking Ryuuichi to read him one of his choosing.
Kotaro is quiet and well-behaved; sometimes he's the only child at the daycare who doesn't cause any trouble for the caregivers. He's very attached to his older brother and sometimes gets annoyed when the other children get his attention. He seems to have a soft spot for the director and calls her "Fluffy" ("Shaggy" in the anime), referring to her abundant hair that makes her resemble a sheep.
Kotaro is well-liked by the other children and cares deeply about their feelings; once, he even decided to stay overnight at Usaida's house to avoid having to choose between one friend and another. He seems to dislike conflict in general, and he tries to mediate an argument between Kirin and Taka, but he is unsuccessful.
Kotaro has a brother, Ryuuichi, and their parents died in the plane crash. After the incident, they are adopted by Youko Morinomiya, the headmistress of Morinomiya Academy, who offers to be their guardian until Ryuuichi comes of age, on the condition that he makes use of her experience caring for the children at the school's daycare.

Age: 17 years old / Daycare Nanny.
Kotarou Kashima's older brother.
He is of average height, with dark hair and large eyes. Considered one of the most attractive boys in the class (the other being Hayato Kamitani), he has been praised by his female classmates for his "calming aura" and his gentleness in treating his brother. [3] He has a soft, feminine appearance, which makes him easily pass for a girl when wearing a wig.
Ryuuichi is a kind and calm person. He easily makes friends with children, and they all love him. When Taka cries, he often comforts him, and the children frequently seek him out when they are sad.
He's also somewhat oblivious and seems completely unaware of his popularity, particularly the fact that Maria Inomata and Ushimaru Yuki have feelings for him. He's even come to believe that girls aren't interested in him at all. Conversely, most girls don't pursue him romantically simply because they feel they can't compete with Kotaro for Ryuuichi's affections.
Despite his gentle nature, he tends to express his opinion frankly when something deeply concerns him. For example, upon seeing Hebihara coldly dismiss his son Hayato, he angrily handed him his report, which included details of what had happened to both children at daycare, as well as the recent photo with the children's other parents, highlighting Hebihara's negligence as a father.
Ryuuichi is the eldest son of the Kashima family and Kotarou's older brother. As a child, and even after Kotarou's birth, Ryuuichi considered his parents free spirits who loved to travel and explore new places, often leaving him alone to care for Kotarou. Shortly before the start of the series, his and Kotarou's parents tragically die in a plane crash while on vacation, leaving the two brothers orphaned.

Age: 17 Years / Daycare Nanny.
Taka Kamitani's older brother.
He is Taka's older brother and the son of the school's science teacher. He is a member of the baseball club and a babysitter along with Ryuuichi. Hayato is a young man of medium-tall height and slender build, with short black hair and amber eyes.
Hayato is always portrayed with a serious and very cold demeanor, which makes the kindergarten children and some of the school students afraid of him. The one who suffers the most from this is his younger brother, Taka, who gets a smack on the head from Hayato every time he misbehaves or tries to get attention, making him cry, and Hayato never seems bothered by it. But despite this, he does have a hidden kindness, like when he joined the babysitting club because his brother was in it and because Kotarou "recruited" him by grabbing his pants and showing him the sign.

Age: 2 Years / Nursery Baby.
Hayato Kamitani's younger brother.
Taka has short, black hair and black eyes. He's a little chubby, as is typical for children his age. He has big, rosy cheeks and always carries his toy sword with him everywhere he goes.
He's considered the mischievous leader of the group. Taka is a boy who loves to play and role-play as superheroes. He's a huge fan of the Super Sentai series, and his favorite ranger is the Red Ranger. He's somewhat spoiled and likes to get his way; he's also teasing but cries when he doesn't get what he wants, or when his brother, Hayato, hits him.
Taka adores his older brother; however, he suffers when his brother doesn't openly tell him he loves him and hits him. He doesn't like being ignored by him, so he cries or constantly plays pranks to get his attention.
Taka loves Ryuuichi very much and is the first person he goes to when his brother hits him and he needs comfort. Usually, it's Ryuu who asks Kamitani not to hurt him anymore.
Taka sees Kotarou as his best friend at kindergarten. Even though Kota is somewhat shy, they get along very well and always play together.
Although they both play at daycare, Taka and she constantly fight. Kirin refuses to participate in their games, and that infuriates her.

Age: 2 years / Nursery baby.
Takuma Mamizuka's twin brother.
Kazuma is Takuma's younger twin brother and the son of physical education teacher Mamizuka Umi and famous actor Mamizuka Kousuke.
Kazuma has messy blond hair and light brown, teary eyes. He's generally considered the most weepy of the group and often has rosy cheeks. He's Takuma's identical twin and is always seen holding his hand or following him everywhere. While his older brother is known for sharing a smile with his eyes with their mother, Kazuma's perpetually teary eyes resemble his father's when he cries.
He is the more conservative and fearful twin, traits he shares with his father, Kousuke. He is easily frightened by new things and cries easily in almost any situation, frequently needing his twin brother's comfort. Because of this, he develops a strong bond with him, although he is sometimes discouraged when his brother's frankness leads him to say hurtful things.
He generally needs a lot of encouragement to do what he wants, which has made him very dependent on Takuma. When his older brother expresses a desire to do something, such as washing Ryuuichi's back during their trip to the hot springs, Kazuma usually goes along with it. When an illness forced the twins to separate, Kazuma's loneliness led him to spend the entire day crying for Takuma.
Kazuma is Takuma's younger twin brother. He is the son of the school's physical education teacher, Umi Mamizuka, and the famous actor Mamizuka Kousuke.

Age: 2 Years / Nursery Baby.
Kazuma Mamizuka's twin brother.
Takuma is Kazuma Mamizuka's older twin brother and is the son of Umi and Kousuke.
Takuma has messy blond hair, rosy cheeks, and light brown eyes. He always wears a big smile and is known for his mother's signature smile. Takuma is identical to his twin brother Kazuma and is always seen holding hands with him.
Takuma has a cheerful and adventurous personality, inherited from his mother. He tends to speak his mind, which sometimes hurts his father's and even his brother's feelings. Kazuma is often seen mimicking his actions and words, and Takuma often says that it's okay "as long as Kazuma is with him." Like his brother, he adores his mother, Umi.
He also has a strong and playful personality, sometimes interpreting Taka's aggression as a game, and is rarely seen crying over difficult situations. Of all the children at the daycare, Takuma is the hardest to scare or anger. His joy is evident in his frequent giggles, which makes him friendly and cooperative with the other children.
Takuma is Kazuma's older twin brother. He is the son of the school's physical education teacher, Umi Mamizuka, and the famous actor Mamizuka Kousuke.

Age: 2 Years / Nursery Baby.
She has no siblings present at the daycare.
She is the oldest of the only girls (little Midori) who attend the kindergarten. Her mother, Yayoi, is the school's drama teacher, and her father, Satoru, is a freelance photographer.
Kirin has reddish-brown eyes and dark green hair, which she usually wears in two pigtails. She often wears dresses with collars or aprons, as well as white puffy shorts. She is frequently seen carrying a large stuffed giraffe, a much-loved possession.
She is very friendly and affectionate. She enjoys playing house and has become friends with Maria Inomata, who frequently returns to the daycare to see her and is happy to have a big sister to play with. She also takes care of baby Sawatori Midori, acting like a big sister.
He is intelligent and articulate, and often clashes with Taka over differences of opinion, such as who is Kotarou's best friend or what game to play that day. Although this clash of personalities seems to suggest their friendship is unstable, as when he once reported Taka for bullying Kotarou, the two always put aside their differences and usually come to an agreement. Taka is also the only child who unnecessarily provokes Kirin, arguing that witches and magic don't exist, which prompts Kirin to retaliate, going to dangerous lengths to prove him wrong.
Kirin cries with watery eyes and red cheeks when she fails at something or even when someone dislikes something she values ​​or someone she values. She has many ideas and is always willing to help others.
She is the only child of Kumatsuka Satoru and Yayoi Kumatsuka. Kirin is very loved by her parents, especially by Satoru, who is extremely protective of his daughter.

Age: 10 Months / Daycare Baby.
She has no siblings present at the daycare.
She is the only baby in the care of the daycare and the daughter of Sawatari Yukari.
Midori has blonde hair, short at the beginning of the series, but it grows longer and becomes thinner over time. Eventually, she starts wearing it tied back in a small bun with a pink hair tie. The color of her hair varies between the different versions: in the manga it's blonde, and in the anime, it's light brown. She has deep black eyes with two prominent eyelashes, a pert nose, and rosy cheeks.
She is usually seen on Usaida's back or in her arms.
Midori is cheerful and energetic most of the time and often says "abu" to agree with others. She has a generally rebellious attitude, as seen when she gets angry at jokes and refuses to let Ryuuichi change her diaper. Having spent so much time with Usaida, she has developed a deep bond with him and genuinely misses him when he's not around. Her first word was an attempt to say Usaida's name. She even mimicked his hand gesture at one point.
Midori is more aware of her surroundings than most people realize. She was annoyed when Satoru didn't realize sooner that she was a girl, and showed it with an offended expression. When Taka started feeling ignored because his little cousin, Tsugumi, was visiting, Midori deliberately soiled her diaper to suggest how he could regain everyone's attention.
She develops a close relationship with Kirin, the other girl at the daycare. They are often seen playing together.
Midori is the only daughter of Yukari, a teacher who works in the academy's office, and Yutaka, a traveling archaeologist.

Age: 23 Years / Daycare Nanny.
He has no siblings.
Usaida Yoshihito graduated from Morinomiya Academy and currently works at the academy's daycare center. He is Midori's primary caregiver and is often seen carrying her on his back.
Usaida is a tall man with shoulder-length light pink hair, which he usually wears parted in the middle and tied back in a short ponytail. He has dark, squinty eyes, giving him a sleepy appearance. He's rarely seen with his hair down; the only times he's seen like that are when he's in his apartment or when he has a fever.
He usually wears an apron and a long-sleeved shirt, and a small hoop earring in each ear (in the manga). He is normally seen sleeping or with a crooked smile. Although he is considered lazy for sleeping all the time, Usaida is helpful and cares deeply for the children, even rushing to the daycare from his house while sick with a fever because he feared Midori was in some kind of trouble. [2] The children in the daycare room seem to trust him a lot and play with him affectionately, despite Kirin calling him "bad" without any redeeming qualities when asked about his virtues.
He appears to be very observant and calm in any situation, easily picking up on Ryuuichi's feelings and offering timely advice and help. For example, when Taka asked about his father, he helped an anxious Ryuuichi who couldn't handle the situation, pointing out to Taka that "not all families are the same" and that Taka still has his brother with him.
Usaida's father was an elite businessman who had high expectations for him during his childhood, so Usaida studied hard. Eventually, his father went bankrupt and decided to go into farming, telling Usaida to live his life as he pleased. Suddenly adrift, Usaida had nothing to do and spent an entire year sleeping every day.

Age: 17 Years / Visits the daycare whenever possible.
He has no siblings.
Maria is a beautiful teenager with dark green hair that reaches halfway down her back, with bangs that fall over her left side, and gray eyes. Just like in the manga, she retains her tsundere personality, and her cheeks blush slightly when she's embarrassed.
Maria has a stern personality and little tolerance for those who attend school for reasons other than studying, which distances her from the other students. Furthermore, she is very strict about enforcing the rules and becomes furious when others don't. Her strong character also protects her well from gossip.
She puts a lot of effort into everything she does, whether it's studying, participating in extracurricular activities, or playing with the other children. Although she's dedicated to her studies and initially doesn't try to socialize with her classmates, she feels the pressure of being alone and becomes more eager to make friends. She's visibly happy when she shares her contact information with new friends (previously, she only had her parents' information). She's a member of the cooking club, though her skills were somewhat limited at first (the cookies she baked were too hard). Over time, she improves her cooking skills to the point that her classmate Yagi believes she's capable of teaching others how to bake cookies.
Inomata appears to be the only child of Gorou and Kimie, who advocate a strict upbringing for their daughter. It was revealed that Maria wasn't allowed to watch television even as a child, and when asked about Kirin's favorite anime, "Petit Pois," she was completely unfamiliar with the characters, though she did enjoy it when Usaida played it for her on her mobile phone.

Yuki Ushimaru
Yoko Morinomiya
Shizuka Kamitani
Taizo Hebihara
Kumatsuka Yayoi
Kumatsuka Satoru
Yutaka Sawatari
Yukari Sawatari
Mamizuka Kousuke
Umi Mamizuka

Kousuke is the father of twins Kazuma and Takuma, and is also the husband of Umi, the physical education teacher at Morinomiya Academy.
Kousuke is a very emotional and fearful person, and has been since childhood. [1] He worries a great deal about not being loved by his children and wife, and tries his best not to disappoint them. Kousuke deeply loves his family and always tries to spend time with them. Unlike his wife, Umi, he gets stressed and angry easily, and is always greatly affected by his children's opinions of him. He passes on his emotional personality to his son Kazuma, while he passes on his wife Umi's more cheerful personality to his son Takuma.
Umi Mamizuka (狸塚 うみ, Mamizuka Umi), née Momoga, is the physical education teacher at Morinomiya Academy High School, the wife of Mamizuka Kousuke and the mother of twins Takuma Mamizuka and Kazuma Mamizuka. Umi has a thick, curly blonde mane with side bangs and is known for her iconic "eye smile".
At school, she usually wears a tracksuit, while at home she dresses more casually. At the beach, she wears a pink bikini.
Like Takuma, Umi has a cheerful and lively personality. Since childhood,[1] she has rarely been seen without a radiant smile. Her parenting style is generally more relaxed and calm than that of her husband, Kousuke. She is a maternal and comforting figure to her son, Kazuma, who cries easily.
Umi cares deeply for her family and lets her enthusiastic children run their first errands on their own (with Kousuke following behind to protect them). She trusts her husband completely, especially when he felt guilty about having to kiss other women as an actor.

Shizuka Kamitani is a science teacher at Morinomiya Academy Junior High School, mother of Hayato and Taka, and ex-wife of the high school's chemistry teacher, Taizo Hebihara.
Shizuka is a slender woman with short, pixie-style black hair and almond-shaped eyes with light irises. Her eldest son, Hayato, looks very much like her. She wears earrings, a long-sleeved blouse, and a skirt. She generally has a relaxed and very calm personality. She possesses great patience when dealing with her talkative and mischievous son, Taka, whom she sometimes regards with a mother's tenderness, but she becomes firm and angry when someone irritates her, especially her teenage son, Hayato, or her ex-husband, Taizou. She has a habit of hitting Hayato on the head when he does something foolish or unpleasant. As with Hayato, she sometimes treats Usaida this way as well when he neglects his work.
Shizuka grew up in the countryside, where rice paddies were plentiful, the night sky was full of stars, and fireflies flew inside houses on summer nights.
Taizo Hebihara is the father of Hayato and Taka Kamitani, and the ex-husband of science teacher Shizuka Kamitani. He teaches chemistry at Morinomiya Academy. Taizo has short, blond hair, parted in the middle, framing both sides of his face. He has narrow, slanted eyes with small irises. His expression is usually serious and expressionless (like his son Hayato's), only changing when he is particularly excited.
He is portrayed as a cold and indifferent person, much like his son Hayato. He is a very strict teacher, marking students absent if they arrive late or remain silent, and forcing them to complete assignments with very tight deadlines during their free time. Even outside of work, Taizou was considered very strict at home, raising his son Hayato and scolding his ex-wife Shizuka for Taka's behavior.

Youko Morinomiya is the wealthy and prickly president of Morinomiya Academy and the Kashima brothers' volunteer tutor. Ryuuichi calls her "obaa-san" (grandmother) and Kotaro calls her "Fluffy".
The most striking features of Youko Morinomiya are her abundant hair and piercing eyes, which remind Kotaro of a sheep (hence her nickname: "Fluffy"). She is elderly and walks with a cane. She almost always wears a simple black dress and a shawl. She rarely smiles, and when she does, her smile is very faint. She is often seen flanked by Saikawa, who is considered her butler/secretary (although his official title is never specified).
She is a very stern person and speaks in a loud, harsh voice, but she does have moments of kindness. She cares for the two boys, but hates it when Kotaro calls her "Fluffy." The student council president has a forceful and austere personality because she is very hardworking and wants things done. However, her kindness often takes precedence over the brothers' well-being. For example, despite having an important meeting, she decided to watch Kotaro's performance in a school play, even though she claimed it was "a nuisance and that she had been forced to come." Throughout the series, she becomes increasingly affectionate towards them and even her secretary, Saikawa, forbidding him from exerting himself when he is sick and taking care of him (with the help of the Kashima brothers) at her home. She keeps all of Kotaro's small gifts—"trash," according to Ryuuichi—such as pebbles and seashells, in a box, which caused her to get bloated trying to hide them. Despite these changes, she rarely expresses herself in any way other than her usual stern tone.
She had a son and a daughter-in-law who lived with her. After their deaths in the same plane crash that killed Ryuuchi and Kotarou's parents, she took them in out of kindness. She remarked that she and the Kashima siblings were "the only ones who didn't cry" at the funeral for the victims' families, and she allowed them to stay with her.

Age: 16 Years / Visits the daycare whenever possible.
Ushimaru Yuki is a student in Ryuuichi and Hayato Kamitani's class at Morinomiya Academy, and he is in love with Ryuuichi.
Yuki is a teenage girl of below-average height with a brown bob haircut. Her male classmates consider her cute and charming. Yuki is a popular girl who often attracts the attention of male students due to her adorable appearance and kind personality.

Although she is kind and soft-spoken, she is also extremely shy and often gets embarrassed when interacting with Ryuuichi, the boy she likes. She often feels confused and uncomfortable around young children.
Ushimaru falls in love with Ryuuichi after witnessing his dedication to caring for her brother, Kotarou. However, Ryuuichi sees her as just an ordinary girl, unlike the other boys in their class. Her crush leads her to meet Maria Inomata, who shares her feelings. Despite this, they don't despise each other or see each other as rivals, and over time they become close friends. Ushimaru teaches Inomata social skills and the importance of building relationships with her classmates.

Satoru Kumatsuka (熊塚 悟る, Kumatsuka Satoru) is Yayoi's husband and Kirin's father. He is a photographer by profession. He is a tall, slender man with the same eyes as his daughter. He keeps his hair short and light-colored, and is usually seen wearing a tie, shirt, and blazer, likely his work uniform. Unlike his wife, Satoru is more emotional, paternal, and romantic, always showing his wife and daughter how much he loves them. Satoru is happily married to Yayoi, the drama teacher at Morinomiya High School. They are Kirin's parents.

Yayoi Kumatsuka (狸塚 海, Kumatsuka Yayoi) is a teacher and leader of the drama club at Morinomiya Academy. She is Kirin's mother.
Yayoi is taller than the other mothers. She has gray eyes and straight, grayish-green hair with bangs and strands framing her face. She always wears a cold and calm expression.
She always wears a black sweater with a gray skirt that falls below her knees.

Sawatari Yukari is the school secretary at Morinomya Academy and the mother of Midori, the only baby in the daycare. Yukari is a beautiful woman with long, thick brown hair styled with side-swept bangs, and brown eyes. She usually wears feminine clothing. Yukari has a calm and kind personality and is rarely seen in a bad mood throughout the series.

She is kind and friendly to both the children at the daycare and the students at the academy.
Sawatari Yutaka is the father of Sawatari Midori and the husband of Sawatari Yukari. He is an archaeologist, and his work keeps him away regularly on expeditions.
His facial features are always hidden by his thick beard and hat. He has a deep, resonant voice that makes him sound much older than he is. He is a reliable man of few words. Like Kumatsuka Satoru, he is very attached to his daughter, though not with the same fanaticism. He is also a loving husband to Yukari.