TV-Series
Description
Park Jaegyeong, better known by her original Japanese name Koyomi Mizuhara and her nickname Yomi, is one of the central characters of the anime Azumanga Daioh. The name Park Jaegyeong comes from the Korean localisation of the series, in which her character was given a fully localized Korean name. In the story she is a high school student who is introduced at around fifteen years of age and is followed through to graduation at eighteen. She is a childhood friend of Tomo Takino, having known her since elementary school, and it is Tomo who gave her the nickname Yomi, a name that became so widely used that even other people around her call her by it. Her full given name remained a mystery in the original manga until the second volume, in which the creator dedicated an entire strip to responding to readers who had asked for it.

In terms of background, Yomi is presented as a studious, disciplined, and comparatively well-off student from a financially comfortable family. She stands at about 163 centimeters, which makes her taller than several of her classmates, and she has a healthy, athletic build that contrasts with her personal worries about her weight. She has long, straight dark hair and wears oval-shaped glasses that reinforce her serious, bookish appearance. She wears the standard school uniform, which changes between seasons, and her casual clothing tends to be practical and understated.

Personality-wise, Yomi is the level-headed voice of reason among her friends. She is sensible, pragmatic, and academically focused, and she values order and common sense. This often places her in the role of the straight man, or tsukkomi, to the chaotic antics of her friends, especially Tomo, who serves as the boke in their comedy duo-like dynamic. Although she presents a mature and composed exterior, she is frequently pushed past her limits by Tomo's impulsive behavior, and she responds with sharp sarcasm, insults, and sometimes physical retaliation in the form of a signature uppercut. She can also be cynical and quick-tempered, and she occasionally displays a mischievous or even cruel sense of humor, such as when she tricks the spice-sensitive Osaka into eating an extremely spicy dish. She also uses noticeably masculine speech patterns in Japanese, particularly when dealing with Tomo.

Yomi's main motivations center on academic success, self-discipline, and a desire to improve herself. She is one of the top students in her class, ranking second academically, behind only the child prodigy Chiyo Mihama. At the same time, she is deeply self-conscious about her weight and constantly attempts new diets, although these efforts usually fail because of her love of sweets and spicy food. She also enjoys karaoke, but she is a notoriously poor singer, which becomes a recurring joke. These flaws make her more layered and relatable than her composed exterior might suggest.

Her role in the story is to serve as the grounded anchor of the main group. She appears throughout the entire series and helps balance the chaotic personalities around her, including the hyperactive Tomo, the spacey and absent-minded Osaka, and the competitive Kagura. Her most important relationship is with Tomo, whom she has known since grade school. Their friendship is defined by constant bickering and a straight-man, funny-man interplay, with Tomo acting as the instigator and Yomi as her main target. Despite the endless frustration Tomo causes her, the two share a deep and enduring bond. Yomi is also a close friend of Chiyo, with whom she shares both academic excellence and a comparatively privileged family background, and she gets along with the quiet Sakaki, the athletic Kagura, and the eccentric Osaka, even though her serious nature often contrasts with theirs.

Over the course of the three years covered by the series, Yomi develops in noticeable ways. In her first year she is established as the calm, intellectual counterweight to Tomo. During her second year, her ongoing struggles with dieting come to the forefront, including an incident in which Tomo discovers that Yomi has been anonymously writing to a radio program for dieting advice and finds it endlessly amusing. On a class trip to an amusement park, Yomi falls ill with a fever and misses the group's roller coaster ride, and Tomo later gives her a commemorative mug with a photo of the other girls that has an empty space where she should have been. In her final year, Yomi decides to pursue higher education, and despite her strong academic record, she is the last of her friends to pass her college entrance examinations, a setback that reveals a more vulnerable side to her normally collected personality. She ultimately passes and celebrates with her friends, closing the series ready to move on to the next stage of her life.

As for abilities, Yomi's most notable strengths are intellectual. She consistently performs near the top of her class academically, and she is logical and knowledgeable enough to frequently point out the flaws in her friends' reasoning. She is also reasonably competent at sports, though not to the level of the more athletic Sakaki or Kagura, which contributes to her insecurities. Her physical abilities are humorously highlighted by her uppercut, which she delivers to Tomo whenever she has been pushed too far. Her most memorable weaknesses, by contrast, are her unsuccessful dieting, her lack of singing ability, and her tendency to let her temper get the better of her, all of which humanize her and round out her role as the sensible but imperfect member of the group.