Eiji Nizuma (Born November 3, 1992 in Aomori-ken, Japan), is a high school genius mangaka who has been drawing ever since he was young. Moritaka Mashiro and Akito Takagi consider him their rival. He was supposed serialize a manga called Yellow Hit but he wanted to draw a different manga, Crow, which appeared in Akamaru Jump instead. His assisants were initially Nakai and Fukuda (and Mashiro also worked for him temporarily before Detective Trap was serialized). His editor is Yujiro. He once demanded that he be allowed to end one series he hated if he ever made it to number one at Jump.
Eiji has brown/red hair that is short with the exception of his bangs (his hair has gotten longer over time). He has brown eyes which are sometimes considered purple. In all of his appearances, he wears the same purple clothing, sometimes wearing sandals. On occasion Eiji wears a plaid, haori-type jacket.
Niizuma is slightly naive, but can also be serious and calculating when he wants to. Eiji tends to act conceited because he is hailed as a genius; however, after working on Crow for quite a long time, he grew more humble, even claiming to not be "good enough of a Mangaka to be judging other people's work" when asked by his editor to judge for the Golden Future Cup. (He judges anyway, but is not very helpful, only expressing his interest in Ashirogi and Ryu Shizuka). He tends to make noises and sound effects when drawing or writing his manga. Eiji is constantly chastised by his editor, and at first seems to be rather oblivious towards his rivals' feelings towards him, even expressing great excitement when he meets Ashirogi Muto and saying he is their fan. He is a great lover of manga and his opinion are valued by everyone at Jump, including his rivals. He refers to himself as an "Eternal Boy" and thats why he writes Shonen manga. He has only ever had a crush on one girl, back in elementary school, which paired with his naivet'e most likely explains his lack of success in the Super Leaders' Love Fest.
Prior to his appearance, Niizuma states in an interview that he placed so high because everybody else was "wasting their time playing video games". At first this infuriates Mashiro because he used to play video games all the time before deciding to pair up with Takagi to write manga. When Mashiro tells Takagi this, they both decide to aim to surpass Niizuma as mangaka.
Ashirogi Muto's Mainstream Meeting
During the meeting Takagi and Mashiro tell Hattori they want to do a mainstream manga, Niizuma comes in. Yujiro is mad about Niizuma doing Crow instead of Yellow Hit. While Yujiro is talking to the cheif editor, Niizuma is talking to Takagi and Mashiro. He tells them he thought Money and Intelligence was the best and also tells them that he wants to be friends with both of them. Takagi and Mashiro are shocked by this, first thinking he's mocking them but they realize he serious. Niizuma later shows them how he draws and Hattori hopes they won't want to do mainstream after seeing him. After he draws it, Yujiro rushes him out so he can draw chapters two and three.
When Mashiro works as assistant to learn from Eiji, Eiji reveals that he had thought up of Crow since he was a child, and that since his family was very poor, he wasn't able to afford video games like his classmates were and simply drew manga for entertainment, which was what he wanted to do anyway. This explains Eiji's jab at video gamers at the start of the series.
Golden Future Cup
Niizuma does not actually participate in the Golden Future Cup, but does participate in the meeting Fukuda holds, with Takagi, Mashiro, Aoki Ko, and Nakai, held because of Koogy's annoucement about his manga. He reads their manuscripts, and says who will get first, second, and thrid. He then says that two will tie for first and one will be third, referring to  Kiyoshi Knight and Detective Trap for first and Hideout Door for thrid, which were reflected in the actual results
New Years Party
He hung around Hiramaru Kazuya before the party started, but couldn't continue because Yoshida takes Hiramaru away to talk about chapter three of Otter #11. He then hangs out with Mashiro and Takagi. He later meets up with Hiramaru after Takagi wins a TV. After the New Years Party He is next seen when Nakai arrives late because he was talking with Aoki. Nakai leaves the days work there and leaves. Fukuda then wonders what he is thinking and Eiji says "Probably about Manga". Kiyoshi Knight and Hideout Door's Serialization Eiji rejoiced with Nakai and Fukuda when the news that both their series would be serialized, but remarked that he is sad that they won't be working together anymore. He later says that Jump is more fun now with Nakai and Fukuda writing for Jump as well. Hiramaru's VisitHiramaru Kazuya visits Eijis apartment to try and hide so he wouldn't have to work. Eiji's assistants were wondering what the author of Otters 11 was doing there. Hiramaru tells Eiji about how he hates being a mangaka and how his office job was better. One of Eiji's assistants called Yoshida because they couldn't get work done and Yoshida takes Hiramaru away to draw his Manga series. Eiji then hears that Detective Trap and Crow tied for 3rd place. He remarks that he is happy but doesn't want to lose.
Creators Strike When Mashiro is hospitalized, Eiji visits him and when he arrives, notices that Mashiro is working on his colour pages for Trap. The both look at each other determined and then Eiji decides to leave, no longer being worried about Ashirogi Muto. His editor Yujiro thinks that Miho Azuki is Tagakis girlfriend because she was helping with the manga but Eiji calls him stupid and says that she looks exactly like Ami-chan from Trap. When Fukuda tells Eiji about Trap having to go on hiatus for a year and suggests a boycott with a few Mangakas, Eiji is immediately on board with the idea. They gather Nakai, Aoki & Hiramaru and go down to Jump. Eiji demands thats if they if their decision is no overturned that he will draw for another magazine until Ashirogi Muto can work again and that he will return his contract money and pay for the others to move to another magazine too. When Mashiro tells them they should stop the boycott, he says he will do it but it would be better to see Mashiro drawing again. He is happy when the hiatus is over. Later, Fukuda calls Eiji and tells him that Nakai and Ashirogi are in trouble, and wonders if there is anything he can do for them. However Eiji tells him that unlike the unfair hospital hiatus there is nothing they can do for them, they have to make it on their own
Judging TreasureYujiro approached him about judging Treasure, but he declined saying "He wasn't good enough to judge others work" but then he accepted when he heard Muto Ashirogi submitted something. After reading the stories, he only said Future Watch (Muto Ashirogi's story) and True Human (Ryu Shizuka's story) were interesting.
Crow managed to get an anime offer and it runs weekly. Eventually, Eiji agrees to draw the story for +Natural, and easily gets the story serialized, constantly placing the story in single-digit positions.
Super Leaders' Love Fest
Eiji becomes excited at the prospect of drawing a romance for the Super Leaders' Fest and attends the party of mangaka with that in mind. When the other Super Leaders all decide on romances as well, Sasaki agrees to make it a Super Leaders' Love Fest. After Eiji draws Love Power A to Z, Yujiro notes that due to the battle scenes, it could become a huge success, while the lack of romantic association with the reader could make it a huge failure. As a result, it places 9th overall and 5th out of the 7 authors, the worst of his works. Niizuma is visibly upset by the result, and it is noted that he has only liked one girl in second grade, contributing to his lack of success in romance manga.
Eiji is later commemorated for his continuing series Crow and +Natural.
Classroom of Truth
Eiji admits that Classroom of Truth's art and the one shot were both good, and compares Nanamine to Ashirogi Muto, but notes that while it would be interesting to see Nanamine surpass Ashirogi, he "can't see Nanamine's face at all". This comment, which is similarly noted by Yoshida, is most directly attributed to Nanamine's concentration on his setting as opposed to the characters that make up the setting.
Niizuma's first serialized manga (still ongoing) was Crow. He was supposed to work on a manga called Yellow Hit, but demanded that he be allowed to draw Crow instead. Not much is known about Crow, expect for occassional comments by the characters and the pictures shown.
He is currently working on +Natural with writer Aiko Iwase in addition to Crow. When +Natural was first being considered for serialization, there was some debate as to whether Niizuma should be allowed to have two stories running in Jump or not.
Eiji won second place in the Tezuka Award with this work, and it is what gets him noticed in the manga world.
Niizuma was meant to draw Yellow Hit for publishing, however he submitted Crow in its place.
- (To Sasaki) "If I become the most popular author in Jump, please give me the right to end one manga I hate." 
- He ranked 1st in Weekly Shonen Jump popularity character polls making him the most popular character in the series.
- Eiji's penchant and talent for mainstream, and the eventual serialization of his former assistants, Fukuda Shinta and Nakai Takuro, draw a comparison between him and Masashi Kishimoto, mangaka of Naruto.
- Eiji's odd behaviour and talent are possibly taken from L a character Takeshi Obata and Tsugumi Ohba previous work Death Note, who is equally skilled and of odd behaviour.
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