Tadaomi Karasuma

Tadaomi Karasuma is a 28-year-old agent sent from Japan's Ministry of Defense to supervise Korosensei. In Kunugigaoka Junior High School, he was admitted as an assistant teacher and as the physical education teacher in Class 3-E.

Appearance
Karasuma is a dashing young man with spiky black hair and eyebrows and piercing dark eyes. He has a tall and muscular build. He dresses professionally in a black business suit with a white shirt and a black tie. He is described as being "cool" by his students.

Personality
Karasuma 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 to be 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 his rival when he was in Air Force Military. From the records throughout the story, it is revealed that Karasuma was an Elite Soldier at the Air Force and a Trainee Instructor before assigned as a P.E. Teacher of Class 3-E.

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 Jelavić 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 because of 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 Shiota 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. However, Karasuma was concerned if he should even encourage such a talent. Karasuma managed to keep his role as PE teacher and realized his growing fondness of the class. He then offers to buy snacks for the class downtown.

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 Ryōma Terasaka and Takuya 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 man 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 announced that 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 anti-sensei 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.

Second Semester
To increase the intensity of their training, Karasuma taught the class the ability to free-run, using momentum and speed to get from point to point in the quickest possible time. Korosensei supported this by pitting himself and Karasuma against the class in a game of Cops and Robbers. Karasuma's inhuman speed and tracking skills allowed him to 'arrest' most of the students but he became increasingly angry when Korosensei allowed the captured students to escape through unethical means by the free students. Later he realised that the freed students started to cover their tracks, making it difficult for him to catch them. As the game drew close to the end, Karasuma was challenged by the four fastest students in the class: Hinata Okano, Megu Kataoka, Hiroto Maehara and Masayoshi Kimura. Accepting the challenge, he chased them down but realised too late that the four led him too far away from the class to catch Nagisa, Sugino, Karma and Kayano who were down by the pool to prevent Korosensei from arresting them at the last minute. Thus the class won and Karasuma was obligated to treat them as a result.

A fortnight before the mid term exams, Karasuma decided to give the class a present of sorts as a reward for their hard work. When the students got into trouble for free-running in the town despite being expressly forbidden to do so, Karasuma was not angry with those involved but disappointed enough to turn a blind eye from Korosensei slapping the students in anger. Indeed he stated that he took responsibility for thinking the class was ready for the increasing intensity of the training. Although the entire class sans Karma bombed out at the exams as a result, Karasuma saw the class learnt from their mistake and presented them a gift from the Ministry of Defense: a top-class state-of-the-art battle suit to replace their usual gym outfits so as not to attract suspicion.

The students' reckless actions would also attract unwanted attention. When Karasuma presented a bouquet of flowers to Irina at the students' behest, he also clarified his relationship with her as being temporary and only for the sake of the mission to kill Korosensei. This caused Irina to storm out of the class angrily and later get herself captured by the God of Death. The class attempted their own rescue mission three days later without Karasuma or Korosensei, both absent at the time, but were quickly defeated. Earlier Karasuma passed by a man selling flowers and recognised a bouquet similar to the one he gave Irina. With Korosensei's unusual assistance, the two tracked the captured class to an abandoned warehouse. Not knowing Irina switched sides, Korosensei fell into a pit trap and Karasuma was horrified to learn that the God of Death planned to kill the students as well as Korosensei, based on the latter's promise not to harm them in any form. Although the overall mission was to kill Korosensei at any cost, Karasuma decided to prioritise the safety of his students and went against the God of Death's plan. He pursued the assassin before the latter could drown the class, along the way showing his true combat skills and fearlessness in disarming traps. Irina also pursued Karasuma but the God of Death activated another trap that buries the two teachers. Karasuma managed to free himself but at the students' insistence freed Irina as well. He later caught up to the assassin and engaged in fierce melee combat. Despite being shot at one point from the God of Death's hidden finger gun, Karasuma eventually punched the assassin in his groin, allowing him to subdue the man and free the class. In the aftermath of the incident Karasuma requested to his superior that the class should not be put into any mortal danger from now on, which his boss agreed to. About this time, Karasuma first heard of the government's master plan to kill Korosensei which would take some time to prepare.

Karasuma's appearances would become periodic for the rest of the second semester. At the time of Nagisa's troubles with his mother, Karasuma was on a business trip in New York but expressly forbade Korosensei to interview the parent. At the end of the school festival though Karasuma found out that Korosensei had ignored his warnings and was upset that the former had the audacity to disguise itself as Karasuma with a wig, making Nagisa's mother to imply that he was embarrassed in having a bald head. Prior to the finals, Chairman Asano demanded more money from the Ministry of Defense to which Karasuma reluctantly agreed to. At the end of the semester he witnessed Kayano's furious attack on Korosensei and listened to Korosensei's past.

Final Semester
When term resumed in January; Karasuma was still worried about the class which was still less than enthusiastic after hearing about Korosensei's past. He and Irina later followed Korosensei and found the class somewhat divided over whether to continue killing him, or to follow Nagisa's proposal to save their teacher. To settle the division, Korosensei proposed that the two sides battle it out in a team deathmatch paintball war. Karasuma acted as the referee and took position at a high point where he could see the entire battlefield. Since he had to act impartial he could not comment on any of the students' positions, and thus he could not call out on Nagisa who had camouflaged himself behind Karasuma. He later witnessed Nagisa and Karma engage in a last man standing melee duel and Karma's eventual surrender. Although Karasuma preferred that Korosensei be killed as intended, he honoured the class's agreement to focus on saving their target but with one condition - the class resume their efforts to assassinate their teacher in February should they exhausted all possible efforts to save him by the end of January.

Karasuma was kept in the dark as the students found a way to save Korosensei though the class decided to continue assassination their teacher until the March deadline passed. Throughout February Korosensei returned to his usual shenanigans which Karasuma believes it is his way to cram as much time with the students as possible. At one point he stated to Nagisa that if Karasuma was ever in a spot of trouble, he can put his faith in Class E on their handling of the situation. On Valentines' Day Karasuma listened to Irina worrying about the students' futures. Knowing that this was not how any hit man should operate, Karasuma invited Irina to work for the Ministry of Defense and gave her a place to stay at his home.

Five days before the deadline, Karasuma found Korosensei working on his graduation album. He left after telling Korosensei to make it a good album before receiving notice of the plan being activated. After leaving the mountain, a beam of light shot down onto the mountain classroom from space and a dome shield was erected to trap Korosensei inside. Amidst the panic, Karasuma intercepted the worried students, telling them to go back home and not talk about the incident to anyone. Two days later Karasuma visited the imprisoned students who earlier tried to scout the guarded perimeter. It was out of his hands in requesting for the students to be freed, that the class should have waited until the guards were less alert and that an elite mercenary group known as the Wolfpack led by Craig Houjou was defending the mountain to intercept any infiltrators. Nagisa still pleaded for Karasuma to let them go but instead, the man threw the boy down and told him to not cause any more trouble for him. He left the class to cool their heads for three days and reiterated that in his opinion Korosensei should still be killed. Nagisa immediately figured out the hidden meaning in Karasuma's words and that Karasuma had actually provided the class with intel. He also subtly implied that Karasuma would back whatever decision the class decided upon.

Three days later Karasuma masterminded the students' jailbreak by sending Irina to assist them. Prior to that, he deliberately gave the Wolfpack false intel on the students so as they would severely underestimate their abilities. After being granted permission to head up to the mountain classroom on the "remote possibility" the class would reach there safely Karasuma left with Irina. When she asked whether the kids will be okay, Karasuma assured her that they will be, that when confined to the school grounds they are the best assassination team on the planet. He did note however that defeating Houjou will be a challenge, and pleaded that the students remember the basics of assassination.

After learning the students had defeated Houjou and his team, Karasuma and Irina head to the mountain classroom. However they are forced to watch helplessly the battle between Korosensei, the faux God of Death and Shiro, the latter two being modified to have superhuman strength. Eventually Korosensei won the fight but physically exhausted. When Korosensei reaches the final moment of his life, Karasuma was entrusted by Korosensei to look after the Class E after they graduate. He says his name (Koro-sensei) for the first time before his execution by Nagisa.

Aftermath - Time After Time
After the assassination of Koro-sensei, Karasuma prevented the Japanese Self Defense Force personnel to enter the school grounds as the school was still under his jurisdiction, giving the Class E the alone time to express their sorrow over their beloved teacher's death. He also organised a bus for the students to leave on after the graduation ceremony. When the reward money was handed to the students, they donated some of the funds (to the nursery being one), kept some to cover their education and living expenses and purchased the Class E mountain along with the classroom while using part of the rewards as upkeep for taxes. The rest of the reward was handed back to Karasuma (representing the government) by Isogai (representing Class 3-E) as thanks for their support throughout the school year.

Seven years later, Karasuma has married Irina and is highly ranked in the Ministry of Defense. He tasks Irina to infiltrate violent terrorist organisations in the Middle East. Uniquely to Irina, he admits that her personality remains unchanged ever since working as colleagues teaching Class 3-E, and wonders how the students are doing now.

It is revealed that Karasuma and Irina have a daughter, who becomes very popular at kindergarten and wins over hearts of boys.

Abilities
Karasuma has monstrous physical ability, almost counted as inhuman, and is able to go toe-to-toe with the 2nd God of Death himself. Because of such abilities, he is able to teach his skills to 3-E in order to assist their mission in assassinating Korosensei. Behind his calm demeanor, he has the desire to fight, as shown when he smiles rarely because he is on the offensive, be it hunting down the class in a game of cops and robbers or battling the God of Death. As revealed by Korosensei, the true reason of his strength is the "deep rage hidden in his heart", but the meaning behind this statement is unknown. He's widely considered the strongest human alive, by both allies and foes alike.
 * Master Hand-to Hand Combatant: Karasuma is at the peak of his physical ability, being able to combat armed amateurs, his former comrade, and even the God of Death.
 * Expert Weapons Specialist: Karasuma is well-versed in numerous weapons, from melee to ranged weapons, he is able to use it to the fullest, even against powerful enemies.
 * Endurance: Karasuma has immense endurance, able to withstand a gas potent enough to bring down an elephant and could recover from its effects faster than its intended time.
 * Intimidation: Although used only once, since he doesn't normally smile, his smile often frightens those who have never seen it before, including Class 3-E, Korosensei and Irina. His smile was even able to tame trained Doberman Dogs, making them submit without any resistance.

Korosensei
Koro-sensei is Karasuma's 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 Korosensei's own request. Various students remark that, under different circumstances, they could have become close friends. It was noted that he never called Koro-sensei by his name (he instead often called Koro-sensei 'Octopus') however he called Koro-sensei by his name for the first time moments before execution by Nagisa.

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 a strictly professional and as a temporary one. He reveals this to her and the students in chapter 99.

However, is revealed that he actually has feelings for Irina too in chapter 160, when he invites her to work for the Ministry of Defence and live with him, a proposal that Irina happily accepts.

In Chapter 179, it is revealed that she has become his wife and works in the Ministry of Defense. He had plans to send her to the Middle East and he was as dense as always while he stated that Irina remained the same as usual from when both were still teachers of Class 3-E.

Class 3-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 while Karasuma considers the class as his fellow professionals. One of students, Hinano has a crush on him and another student, Nagisa has inherited every skill he taught (for assassination) and even values him as the most talented assassin on the class. He is also entrusted by Koro-sensei to look after Class 3-E even after they graduate from Junior High School.

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 he 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." 
 * (His speech after selecting Nagisa to duel with Tataoka) "As part of the same group entrusted with the mission of saving earth... I think of you all as a fellow professionals. As professionals, I believe the barest minimum you should receive as compensation is the guarantee of a normal middle school life. That's why there is no need for you to force yourself to take this knife. I will endeavor to request that Takaoka maintain that "compensation"
 * (First impression of Nagisa after defeating Takaoka) "This is a talent that which would absolutely never be discovered during the course of a school life! A talent for drawing closer while hiding one's bloodlust. A talent of making ones opponent falter through bloodlust alone. A talent for being at ease "Acting in front of an audience"! That chill I felt during training wasn't training at all. It was a real assassination! This is neither a talent for combat nor a talent for violence. It's a talent for assassination! Is this a talent which should be fostered?!
 * (Thinking about the Past and Present) "So it has already been 7 years since we first met. She hasn't changed a bit. I wonder if both....no...all three of our students....are still doing well.

Trivia

 * His motto is "If something is possible, carry on as planned. Even if isn't possible, do it anyway"
 * Dogs are his favorite animals, 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, though this may have been an exaggeration on the students' part.
 * He always eats either hamburgers or cup noodles when at School.
 * Aside 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. He is noted to only smile when in combat.
 * When compared to Irina in Chapter 27, he's listed as "seduction-proof." When thinking of a way for Irina-sensei to seduce him, the students ended up dissing Karasuma for being the problem instead.
 * In the popularity poll of Volume 12, he was ranked 4th.
 * His most prominent weakness is that he is very dense.