Tadaomi Karasuma

Tadaomi Karasuma is an agent sent from Japan's Ministry of Defense to supervise Korosensei. In Kunugigaoka Junior High School, he was admitted as an assistant teacher for Phys. Ed. in Class 3-E.

Appearance
He is a dashing young man with spiky black hair and piercing eyes. He has a tall and muscular build. He dresses in a black business suit with a white shirt and a black tie.

Personality
He is a strict but kind man, though he keeps a distance between himself and the students due to his status as an agent and his own professionalism. He is also extremely dense when it comes to love, but isn't so oblivious that he doesn't figure it out eventually. Even though he comes off as distant, he's not completely devoid of emotion and seems able to express happiness very rarely; most notably, during violent situations.

History
He is well known amongst militaries for his outstanding reputation and is a powerful individual, which he has proven when he easily overpowered Lovro, who is a retired assassin. Akira Takaoka considered him as his rival when he was in military.

First Semester
Karasuma first appeared to class 3-E announcing Korosensei's deal with the government and their mission to assassinate him before the end of the year. He later became the assistant teacher and P.E. instructor of class 3-E to train the students. For much of the series Karasuma played the supporting role in training the class to become assassins, hiring other professional hit men (including Irina Jelavic and Red Eye) to assist in the mission and otherwise acting as the intermediary between the class, Chairman Asano and the Ministry of Defense.

He first receives the spotlight when he is the target of a mock assassination between fellow teacher Irina Jelavic and her mentor Lovro, showcasing a hint of his skill set. However he plays a major role when former colleague Akira Takaoka briefly replaced him as PE teacher. At the time Karasuma began doubting himself as a good instructor because of his professionalism but with Korosensei's words came to his students' rescue after seeing Takaoka's sadistic methods. The two almost came to blows until Takaoka challenged Karasuma to pick a student to fight him using a real combat knife. Karasuma chose Nagisa based on a feeling he felt when the boy earlier tried sneaking up on him. His instincts were proven true when Nagisa defeated Takaoka with a surprise attack, and believed that he has the talent for assassination. Karasuma managed to keep his role as PE teacher and realised his growing fondness of the class.

Assassination Island arc
In preparation for the upcoming assassination on Okinawa, Karasuma brought in Lovro as a special instructor to train the class. The two talked that neither could get in touch with their preferred contacts, in Karasuma's case hearing unsettling rumours swirling in the Ministry of Defense. At the island resort, Karasuma watched the students carry out their ambitious attempt though true to Irina's earlier predictions, it failed when Korosensei transformed himself into a ball protected by an invincible shield.

The situation became worse when ten of the students succumbed to virus, and Karasuma receiving a call from the mastermind demanding a trade: the antidote for the immobile Korosensei, to be delivered by Nagisa and Kaede Kayano. With the healthy students eager to help their friends, Karasuma leads the group in infiltrating the hotel where their new foe is staying. Although able to sneak past the main lobby full of guards thanks to Irina's distraction, they encounter a professional hit man on the first floor. Karasuma pulled Terasaka and Muramatsu back from him but unable to escape the gas which engulfed him. He managed to defeat the hit man with a swift kick but the energy and momentum caused Karasuma to be incapacitated for much of the infiltration. As such he is forced to watch the students take on the hit men effectively on their own while being supported by Isogai. Karasuma eventually recovered enough of his strength to choke an unsuspecting guard on the top floor and lead the class to ambush the mastermind. However he is shocked to see their enemy being none other than Takaoka, who returned to the Ministry of Defense in humiliation and stole funds to hire the hit men the class encountered to kill Korosensei. With Takaoka holding the detonator to the C4 strapped to the suitcase containing the antidote, Karasuma was forced to witness Nagisa obediently comply to Takaoka's demands and afterwards helplessly watch the antidote get destroyed regardless. Despite the seriousness of the situation Nagisa was able to defeat Takaoka for the second time and Karasuma had the latter arrested. The hired hit men the students faced off against willingly came quietly and the poisoned students had never been in any mortal danger.

After the incident Karasuma directed efforts to bury Korosensei in concrete surrounded by water and filled with BBs. But to his chagrin, Korosensei escaped the makeshift burial with no effort and returned to his normal form. Prior to leaving the island, a clueless Karasuma spent a dinner date with Irina in the students' efforts to spark romance between the pair. Irina left after speaking about her first kill though Karasuma mistakenly thought she was practicing a new seduction technique on him.

Abilities
Karasuma is a very powerful person, strong enough to stop a girder swinging at him at high speed. He is at the peak of his physical ability, and is highly skilled in using knives and firearms alike as well as hand-to-hand combat. Highly skilled in Ukemi as well as having high speed and mobility. As revealed by Korosensei, the true reason of his strength is the "deep rage hidden in his heart", but meaning behind this statement is unknown. He's widely considered the strongest human alive, by both allies and foes alike.

Korosensei
Koro-sensei is his target. Most of the time, he seems annoyed and exasperated by him. Unless they are educating, they don't get along in the slightlest. He seems well informed about his past and motivations, but refuses to talk about them, presumably at Koro's own request. Various students remark that, under different circumstances, they could have become close friends.

Irina Jelavić
Irina is his coworker. Since the start, he's reluctant to hire her, considering her a danger to the students wellbeing. The start couldn't have been worse, as Irina shows absolutely no interest on the safety of the class, prompting Karasuma to tell her to change her attitude or she would be replaced. After she grows fonder of the class, their relationship turns cordial at best. He constantly chides her for her lax attitude and lack of professionalism, as she does the same to him for his stuffiness and extreme distance.

At one point, he becomes aware of Irina's growing affection for him, but he seemingly has no interest on reciprocating it, as he sees their relationship as an strictly laboral and temporary one. He reveals this to her and the students on chapter 99.

Class E
Despite his best attempts at keeping his distance, he grows fond of the class as time passes by. The students appreciate him greatly, but also respect him to the point of fearing him.

Akira Takaoka
A former fellow officer of Karasuma's that worked in the same Air Force unit as him. During their time as trainees, Karasuma was superior to him and didn't pay much heed to his efforts. This caused Takaoka to develop a strong hatred for Karasuma and sought to show him that he was the superior one which ultimately failed.

Quotes

 * (Thinking about Class E) "A group of junior high school students are joyfully discussing an assassination. If you look at it normally, this is the pinnacle of madness. But it's strange. The students who are the most lively are those of Class E, who have the target as their homeroom teacher." 

Trivia

 * His motto is "If something is possible, carry on as planned. Even if isn't possible, do it anyway"
 * Dogs are his favorite animal, but if he passes in front of one it'll bark at him like crazy.
 * He was called "Straight Lace" during class 3-E training using code names.
 * Karasuma appears as a Story Mode NPC in the PS3 game J-Stars Victory Vs, along with Nagisa and Irina.
 * His ideal type of woman is someone who is ideal for battle.
 * Asides from his military career, he has a valid teacher license.
 * His smiles have been noted as terrifying by the students and can even terrify the gun-equipped dogs trained by the God of Death.
 * When compared to Irina in Chapter 27, he's listed as "seduction-proof."
 * In the popularity poll of Volume 12, he was ranked 4th.