Najimi Ajimu, or Anshin'in as she prefers to be called, has existed for over 3 trillion years before the universe was even created, and 3,402,193,822,311 years by the time of the series. Unlike Pluses like Kurokami Medaka who see themselves above normals, or Minuses like Misogi Kumagawa who see themselves below normals, Anshin'in belongs to an ideology she calls "Not Equals". Anshin'in and the other Not Equal, Hanten Shiranui, do not see themselves as above or below humanity, but rather see humanity as something that cannot begin to be compared with them, thus being "not equal" to them.

Anshin'in comes off as cold and calculated, always having the upper hand in any confrontation she appears in. This is due to her absurdly expansive arsenal of abilities. She holds 7,932,135,441,523,222 Abnormalities and 4,925,916,526,110,643 Minuses. This gives her 12,858,051,967,633,865 different skills to use. Her skills are classified into ten categories (Sword, Martial Arts, Magic, Mental, Biological, Boss, Gun, Ninja, Protagonist, and Miscellaneous) and include almost every conceivable power one can have, many with very open-ended limits. One such example "Alibi Block", allows Anshin'in to appear wherever she wishes, whether that be to the next rooftop, behind a character, in someone's dreams, or even hell itself should she wish it.

Anshin'in is the chief architect of both the Test Tube Plan and the Flask Plan, which seek to create a perfect human, a seemingly impossible task. Three years before the series, while attending Hakobune Middle School to observe the first human she had expectations for, Misogi Kumagawa, she and Hanten Shiranui were sealed by him through the use of his minus, Book Maker, which strips people of their power and reduces them to Kumagawa's level. While sealed, she had little use of her more fantastical powers, but could still use simple ones such as Alibi Block. She frequently used this to appear in Kumagawa's dreams and mind in order to speak with him. She was able to bargain with Kumagawa to give up his minus in exchange for a new one called "Hundred Gauntlets", which he later developed into "All Fiction". As Kumagawa began to change for the better due to his defeat at the hands of Kurokami Medaka, the seal which took the form of screws on her body began to vanish, and she transferred into Hakoniwa Academy to continue the Flask Plan.

Kurokami Medaka's Successor Arc
~!Just as the student council learns of the threat that Anshin'in poses, she appears before them and explains that she seeks to restart the Flask Plan that they had just previously shut down. When faced with the prospect of having to fight Medaka, she declines, stating that if the world was a manga, then Medaka would be the main character, in which case Anshin'in would be fated to lose. As such, she simply decides to wait for Medaka to graduate so that she can fulfill her goal unimpeded. The council begins its process to select successors to fight against Anshin'in to prevent her from succeeding, but it is revealed that all of the candidates, and approximately 700 million people in the world, have part of Anshin'in in them. As tensions grow in the student council, Zenkichi Hitoyoshi fights with Medaka and claims that he will defeat her. Seeing this as an impossible task, Anshin'in helps train Zenkichi along with the help of Hanten Shiranui, who creates the skill "Devil Style" for him, which nullifies any and all coincidence and plot convenience. In the student council election, Zenkichi is victorious over Medaka, something that Anshin'in considered impossible. For something so impossible to be accomplished so perfectly, the world would have to be a manga. She had never found a problem she could not solve, and needed to confirm if there was anything which was impossible for her to accomplish. If something that seemed impossible really was, then that would confirm to Anshin'in that the life she was living was indeed real. The fact that the impossible was actually possible was proof that she lived in a manga, and this was something that Anshin'in could not accept, and attempted to take her own life. However, she is stopped by Medaka, who considers her perception to be a "simulated reality", and is convinced to try living as a student for some time to get some perspective.!~

Jet Black Bride Arc
~!As the second black wedding ceremony approaches, Medaka seeks out a team sufficiently powerful to defeat her suitors. She chooses Anshin'in along with Kamome Tsurubami, Hanten Shiranui, Hansode Shiranui, and Kumagawa. After arriving at the aircraft carrier, Black, Anshin'in swiftly defeats the doubles of the suitors using six hundred of her skills, allowing the group to move forward to the real suitors. Zenkichi claims that the weakness of the team he calls "All Jokers" is that they all do not dodge the first attack. This is utilized by style user Momo Momozono, who traps everyone except Medaka in cards. Anshin'in idles about for some time, but then decides to break out after enjoying some of the seal a bit more. Medaka bargains for the release of Anshin'in and Hanten, and Anshin'in readies to defeat the rest of the suitors, but is stopped by Medaka so that she can play their game.!~

Unknown Shiranui Arc
~!Anshin'in, along with Medaka, Kumagawa, and Zenkichi, travel to the Shiranui village to search out Hansode Shiranui after she asks Kumagawa to erase her enrollment at Hakoniwa Academy. Whilst there, the group is ambushed by Iihiko Shishime, Anshin'in's enemy of over five thousand years previously whom she could not defeat after over 100 million attempts. Anshin'in tells the others to escape while she holds Iihiko off, where she fights to the death for the first time. She is cut in half by a Iihiko, and presumed dead by her double, Hanten. She meets with Kumagawa in his mind once more in what she claims is an automated message should she die and returns Kumagawa's Hundred Gauntlets which allowed him to use All Fiction again, as well as a new skill known as Unskilled. As Zenkichi prepares to have a final showdown with Iihiko, Anshin'in is one of the voices to call out to him, and then speaks directly to him to encourage him.!~

~!Anshin'in's message for Kurokami Medaka for the 100 flowers run is a request to play again, affirming in Medaka's and Zenkichi's minds that she is still alive, as she would not make a promise she could not keep.!~

Kurokami Medaka, a first year, is elected as Student Council President, and the first thing she does is establish a suggestion box, later dubbed by students the "Medaka Box". Medaka encourages students to submit any problem to the box without hesitation and promises to take on any issue from anyone. 
 
Since Medaka won the Student Council elections with a staggering 98% of the vote, she ends up as the Council's only member. She asks her childhood friend, Hitoyoshi Zenkichi, for help and he grudgingly agrees, becoming the Student Council's lowest ranking member. Soon Medaka recruits two more people to the Student Council, the former judo club member Akune Kouki as secretary and the current swim club member Kikaijima Mogana, on loan for 300 yen a day, as treasurer. 
 
Now the Student Council members spend their days solving the problems submitted through the Medaka Box, whether they be hooligans in clubs where they don't belong, girls who need help writing love letters or people who've lost their pets, gradually earning the respect and admiration of the entire school. 
 
Included chapters: 
Volume 15 contains the gaiden "Good Loser Kumagawa" (グッドルーザー球磨川); Jump NEXT (2011/12/26) 
Volume 22 contains the gaiden "Good Loser Kumagawa Final" (完結編).

What started as a simple assistance program has escalated insanely out of control, and now Medaka Kurokami finds herself exposed as something far more than human. But that's only the beginning of a new series of shocking revelations that lead towards a dark secret plan that not even the unbelievable power of her War God Mode may be able to withstand. Still, Medaka's proving to be good at thinking outside of the box, and if she needs the full backing of every hidden resource of the Student Council to meet the challenge, then that's what she's going to get. Even the Abnormal ones! 
(Source: Sentai Filmworks) 
 
Note: Episode 12, titled "Seitokai wo Shikei Shikkou Suru", is part 4 of the "Good Loser Kumagawa" series.

__Height:__ 153 cm 

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She is admired by many of her fellow actors and fans because of the fact that she has a great amount of power and strength in her singing voice, which surprises many fans due to her regularly petite stature. She was also the winner of the "Best Musical Performance" award in the first Seiyuu Awards. She was also part of the quartet Prits alongside Yumiko Kobayashi, Natsuko Kuwatani, and Hisayo Mochizuki (all four voiced characters in the anime _Sister Princess_). Her singing style comes from singing Enka since she was young.

In July 2020, she married someone from the music industry, and they had their first child on March 16, 2021.

__Non-Anime Roles:__
- Ittasha in Bakuage Sentai Boonboomger

Brittney Marie Karbowski is an American voice actress who has voiced in a number of English-language versions of Japanese anime series for ADV Films, Funimation and Sentai Filmworks, most notably, Black Star in Soul Eater. She also voices as Wendy Marvell in Fairy Tail, Mikoto Misaka in A Certain Magical Index and its spinoff, A Certain Scientific Railgun, and Yuri Nakamura in Angel Beats!.

Good Loser Kumagawa takes place two months before Kumagawa transfers to Hakoniwa Academy, and details his time at Suisou Academy. This is the story of Kumagawa's one month-long battle with Saki Sukinasaki, a battle that ended with the closure of Suisou Academy and no winner. 
 
Note: Parts two and three of the "Good Loser Kumagawa" series.

Misogi Kumagawa, the 66th president of Hakobune Private Middle School, makes an unprecedented request to the new student, Medaka Kurokami. The episode of Medaka's middle school days, which have been shrouded in mystery, are now revealed! Episode 0, "Hakobune Middle School 1st Year, Medaka Kurokami!" The "final" and "first" story comes to light!