|Also Known as||Yumeno Sakiko|
|Physical and Vital Statistics|
|Manga||Volume 1, Chapter 1|
|Japanese Voice||Yuichi Nakamura|
|English Voice||Ty Mahany|
Umetarou Nozaki (野崎 梅太郎 Nozaki Umetarō) is the series' titular protagonist. He is a high school student, and the subject of Chiyo Sakura's affection. Nozaki works as a manga artist under the pen name Yumeno Sakiko, currently illustrating 'Let's Fall in Love'. His manga is being published by Monthly Girls' Romance.
Umetarou Nozaki is a tall high school student. He has sharp, black eyes and short, black hair. He has a muscular figure from training in the past, when he was the captain of the basketball club in his middle school. His school uniform consists of a grey blazer with the school symbol under the pocket. This is worn over a collared white shirt, which is tucked in, and navy blue pants. He also wears a skinny red tie and brown shoes.
Umetarou Nozaki is a talented manga artist who has a lot of passion for his two main characters, Saburou Suzuki and Mamiko. In fact, he is so passionate about manga that his life seems to revolve solely around doing research for it. For example, he loves Valentine's Day because the great variety of chocolates and pretty packaging make great references.
Despite making a romance-oriented manga praised for its sensitivity to girls' feelings, he has no personal experience in love and is rather blunt towards girls. His story ideas are often ridiculous and far-fetched, and he is rather unromantic in real life. He appreciates Chiyo's drawing ability but is apparently oblivious to her feelings.
Nozaki is extremely blunt when it comes to things like pointing at a girl's bra and saying that it is showing, and explaining to Sakura that he had never experienced his first love, despite the fact that he claims he is a love expert. He is oblivious and dense when it comes to love and feelings himself, especially those of Sakura.
He is so oblivious and dense to the point that he appears silly at times, doing absurd things such as trying on a girl's sailor uniform for research. Despite him being oblivious to Sakura's crush on him, he enjoys her presence and is often seen both around and outside of school with her.
As a manga artist, he has a lot of talent in drawing characters such as Suzuki and Mamiko but cannot create characters without using real people as models. He once tried creating new characters from scratch, but ended up with several male characters that looked identical to his male lead, Suzuki. Thus, he now gathers ideas for characters from people-watching. And along with Sakura and Mikoshiba, his background skills are lacking. Hori now helps him with the background, but before Hori arrived, Nozaki tried to avoid the problem of drawing backgrounds as much as possible.
- Main Article: Umetarou Nozaki/Plot
Nozaki respects Sakura, despite being oblivious towards her feelings regarding him. He also admires her artistic skills, as he had noticed - and was impressed by - Sakura's posters around the school, long before she first approaches him. Nozaki considers Sakura to be a good friend whom he is willing to confide in, sometimes going out of his way to ensure that she is not upset.
As a friend, Nozaki used Mikoshiba as a model for his heroine, Mamiko. Though unknown about where did he and Mikoshiba meet, it can be seen that Nozaki and Mikoshiba are close friends.
Nozaki first met Wakamatsu in his junior high school time, being an idol for him, as he was one of the starters in the basketball main team. Wakamatsu eventually ended up in the same high school as Nozaki, and he respects the latter just as much, though Wakamatsu still wanted Nozaki to sometimes play basketball with him.
Hori works for Nozaki by drawing backgrounds for him. In exchange, Nozaki writes scripts for Hori because Kashima frequently plays the character of a prince, and not many plays include a prince in them. Hori requested that Nozaki doesn't tell anybody that he helps him with his manga, because he is afraid that Kashima will find out and attract all of her girlfriends to Nozaki's apartment. Although Hori and Nozaki seem to get along, Hori hopes that Nozaki will someday learn to draw backgrounds on his own.
Nozaki knows that Seo is the choir club's Lorelei and actively hides this fact from Wakamatsu. He views her as slightly intimidating. A side character, Oze, was modelled after her in Let's Fall in Love. Oze is the developing romantic interest of Waka, a side character modelled after Wakamatsu.
Mikoshiba introduced Kashima to Sakura and Nozaki when Sakura asked Mikoshiba if he had any friends that would fit well in a shoujo manga. When writing scripts for Hori, Nozaki stated that meeting Kashima was a mistake because he couldn't view her as a generic prince once he discovered how much she flirted with other girls. Nozaki doesn't usually use Kashima as reference for his manga, but he later said that she might be a good reference for Suzuki.
Mayu is (Umetarou) Nozaki's younger brother. Since Mayu is so lazy, he sends very minimalistic texts which only Nozaki is able to understand. When Mayu was little, he was teased for not speaking, so Nozaki protected him from bullies. As he grew older, Mayu continued to be lazy and reliant upon others. When Nozaki stopped living with his parents, Mayu was opposed to him leaving, but decided it wasn't worth the effort to stop him. Despite Mayu's laziness, the two brothers seem to care for and understand each other very well.
Yumeko is Nozaki's younger sister. Although her favorite manga is Let's Fall in Love, and she even declares Yumeno Sakiko to be her god, she is not aware that Nozaki is the author. Nozaki tried to prove that he is Yumeno Sakiko by signing his autograph, but Yumeko was still not convinced. She also didn't take him at his word when he told her how he met Sakura. Yumeko appreciates her brother because he buys shoujo manga for her. Yumeko got discouraged when she learned that both Mayu and Nozaki were much better at drawing then her. Nozaki tried to help her draw and encouraged her to submit her drawing to the monthly magazine, but since her drawing was terrible, he wrote that she was three years old.
- [to Sakura about Mikoshiba]: "Although it started out as an observation to create a character, we quickly became good friends." 
- His birthday is on Plum Day (Ume, as in Umetarou, means plum).
- His family consists of his father, mother and two younger siblings in middle school (Mayu and Yumeko).
- His hobby consists of working on his manga and browsing the internet.
- He spends his holidays working and shopping.
- Nozaki is a self-proclaimed expert at love consultation.
- He is not good at dealing with anything related to Maeno.
- He prefers wearing dark colors.
- His best subjects are Modern and Classic Literature, Japanese History and Home Economics.
- His worst subjects are World History and English.
- His elective subject is Art.
- His favorite food is rice.
- His least favorite food is European cuisine.
- His type of girl is 'a girl who has determination'.
- His gym elective is judo.
- In the character popularity poll conducted in the fanbook, Nozaki ranked 6th.
- He was part of the 18th graduating class in middle school.