Kokoro Mitsume

Early Life
At a young age Kokoro was diagnosed with it Alexithymia. A personality trait where by she displayed an inability to identify and describe her emotions. Despite this a strong "curiosity" of understanding these emotions she could not display herself remained. Kokoro would collect date from observing others emotional patterns and compare them to previous research to deduce what emotion the person was displaying. Her ability to "read people minds" though her years of research lead to her being recognized as the "Ultimate  Psychologist". Kokoro goal of finding a "pure" emotion lead her to join "The New Academy for Ultimate Students". She believed it best to try old fashion pen and paper while observing the other Ultimate's.

Prologue
During the beginning of the "The New Academy" class trip, Kokoro did her best to observe her fellow Ultimate's from afar.

Chapter 1
After the killing game was revealed, Kokoro displayed no real emotion as per usual. However, she noticed a change in Rin Satsuki as she became a completely different person (Choleric Rin). Though what Kokoro had interest in was the in between point of the transfer where Rin displayed no emotions. She then first searched the island unsuccessfully looking for the control center for Monokuma. Kokoro called Monokuma as she wanted to know what would happen after the first trial. He then revealed to her that the killing game wouldn't end afterwards. She then requested a message system on the Monopad so she would be able to communicate with the others without having to remain too close to them. However, Monokuma said it would take sometime to complete the upgrade. After the revealing of the motive Kokoro, continued her observing of the others and began taking notes on all of the other students. Her notes contained information on each student and their likelihood of surviving the killing game. Though she believed staying away from the other was best for her safety, after Ibuki Mioda stated that she "shows her heart when she performed", Kokoro couldn't turn down the chance to see "true emotion".

Chapter 2
After the death of Mikado Sannoji, Kokoro spoke with Maki Harukawa and after seeing the affected Mikado had on her blamed herself for encouraging Maik to make bonds wit the others. Waking up on the on the RMS Monokuma Kokoro observed Rin display her no emotion persona. Kokoro, believed it best to work alone and stay away from her fellow students to avoid any "inconveniences". During her time searching the second island she encountered Setsuka Chiebukuro and Sayaka Maizono. Kokoro, told them of her talent and how she know who the traitor was because of it. Despite this they both stated they trusted her leaving her a bit puzzled. After the motive was given, Ren Shirogane said that he believed her to be the traitor. She then informed him that she understood why he didn't trust her. Kokoro then sought out Rin again to try and uncover more about her new persona. "Phlegmatic Rin" introduced herself as a personality created out of necessity when all three others (Melancholic Rin, Choleric Rin, and Sanguine Rin) didn't want to be in control of Rin. Kokoro saw a lot of herself in Phlegmatic Rin and during their conversation was encouraged by Phlegmatic Rin to not distance herself too much from the other. As is was the only way to truly succeed in her research. Kokoro again talked to Ibuki, and despite telling Ibuki that she was in a way using all the other students for her research even with the killing game on going. Ibuki, stated she was there for Kokoro as a friend and she believed in her. Kokoro, still didn't really understand Ibuki but she viewed her as dependable (And for some reason was less bothered by Ibuki loud way of speaking).

Rin Satsuki
Though she has researched Dissociative Identity Disorder she has never heard of a case as severe as Rin's. Each of Rin's "other" personalities identify as individuals. "Melancholic Rin" who has always been forgotten and believes everyone will eventually forget her. "Choleric Rin" is the more high strong personality, viewing herself above the "others" and most of the other students. "Sanguine Rin" who is the more light-hearted and free-spirited personality. "Phlegmatic Rin" who is the less emotional and introverted personality. All personalities emanating from one being. Kokoro believe if she can fully understand Rin's personas she could assist her in finding her true self. In addition, Kokoro views Rin as a chance to finally accomplish her goal of seeing what a "pure" emotion is.

Ibuki Mioda
When Kokoro first met Ibuki she viewed her as a pretty single-minded individual. Also a very loud individual as well. Despite their differences Kokoro enjoying seeing someone that never hides their emotions. For example, the reason Kokoro went to the concert was to see Ibuki "play her heart out". And through their time together Kokoro began viewing Ibuki as a dependable individual. Though she is still not to fond of the nickname "Kokonut'.￼

Maki Harukawa
Kokoro views Maki as someone with similar ideals as her. Both not wanting to initially disclose there ultimate to the others. Despite knowing Maki's real talent Kokoro didn't feel compelled to tell the others as Kokoro herself was hiding her talent. Kokoro encouraged Maki to make bonds with the other seeing it as a key to surviving the situation they were in. Kokoro also believed Maki should tell the others of her true talent and reassured her that they wouldn't abandon her.

Sayaka Maizono
Kokoro only really started interacting with Sayaka on the second Island. Despite being told about Kokoro's talent Sayaka still wanted to learn more about her. Kokoro believe that once she had informed Sayaka of how she was able to read people Sayaka wouldn't have any more reasons to continue the conversation. Kokoro was surprised by her continued desire to know more about her. Sayaka then displayed her "psychic" ability reading what was on Kokoro's mind. Intrigued by Sayaka display of intuition, Kokoro agreed to talk again with her.

Setsuka Chiebukuro
Kokoro views Setsuka as blissfully ignorant on occasions. After revealing that she knows the identity of the traitor, Kokoro encourages Setsuka to continue her plan of trying to befriend them. Believing it to be the best solution to dealing with the traitor. Kokoro also showed the notes she had written on her fellow students to Setsuka. Despite this Setsuka still said she trusted her much to the bewilderment Kokoro.