Akira Takaoka

Akira Takaoka is a professional killer, and former ally of Tadaomi Karasuma.

Personality
He looks like a very kind and helpful person in his first appearance in the chapter until the second half of the next chapter reveals that he's a sadistic drill instructor who abuses his strength and power by brute force and violence. He doesn't even hesitate beating up anyone even the students (such as kneeing Maehara and slapping Kanzaki when they object his training) just to show how powerful he is. The truth is he doesn't care of the students life at all as all he cares is gaining fame after they kill Koro-sensei due to his teaching and Karasuma would acknowledge his method and gets to boss around as long as one of the students survives his hellish training. He hates to lose to anyone especially Nagisa especially when he makes a rule of using a real knife.

After getting fired and losing to Nagisa, he was shock to me more psychopathic when he plan to poison most of the students in Okinawa. He was jealous and keeps scratching his face due to being mocked by his colleges when he loses to Nagisa. After confronting with the students again, he threaten everyone that he’ll blow up the antidote if he doesn’t face Nagisa and force him to forgive him (but once again break his promise as he blows up the antidote just to see his despair face and want him to suffer his ‘death’ of his friends). Once he loses to Nagisa for the second time, he went into a blank state after seeing Nagisa’s killer smile expression.

He has an obsession of seeing a person's despair face and sadistically beat/kill the person just to gain control of everyone by forcing himself to be their ‘father’. He also has a habit of raising his tongue whenever he has the upper hand.

History
When he was in military, he was able to produce elite loyal troops in a short span of time by connecting with them as a tightly-knit family and standing as a violent father at the same time.

Plot
He first appeared as a new P.E. teacher for Class 3-E sent by Ministry of Defense as they were impatient of killing Koro-sensei. Once he appears he greets the students and gives them food, drinks and sweets as a sign of greeting to him. He tells Class 3-E (minus Karma who skip classes again) that he'll be taking over the P.E. class from now on and self-proclaims himself to be their 'father'. Karasuma was then informed by the female bodyguard who accompanied him telling him that he's very dangerous. Sure enough, once Karasuma sees a second picture of him showing his 'previous family' his abuse, he begins to gives Class 3-E's a hell schedule with no time to study. He knees Maehara and slaps Kanzaki when the object his training and force Karasuma and Koro-sensei to see his hellish method of training. His goal is to gain fame and popularity after one of the students kill Koro-sensei due to his training and gets to boss Karasuma around. After attempting to punch Kayano who calls Karasuma for help, Karasuma steps in to stop abusing the students. Anticipating his actions, he decides to make a wager that if one of the students Karasuma selected stabbed or poke him with a knife, he'll leave the rest to Karasuma and leaves the place otherwise Karasuma has to allow him to follow his hellish training with no objections. However he makes one of the students uses a real knife knowing he'll gain the upper hand as he knew his students had never held a real knife before.

Once Nagisa was selected, he belittles Karasuma for his decision as he observes Nagisa as the 'weakest' among the students. His actually plan is to avoid Nagisa's attacks and beat him up so badly that the students would forcefully listen to him. Added, he also wants to see his despair face as regardless if he loses or forfeits the match. Unexpected, Nagisa casually walks towards him with a smile as he’s ‘walking to school’ and manages to beat him. He was shocked that he lost and after regaining his shock, he refused to accept his loses and asks for a rematch. He finally snapped when Nagisa refuses to fight him and was about to attack him when Karasuma elbows him in the face. To add insult to injury, Gakuhou Asano came and fires him due to his actions (breaking his promise) and being a horrible instructor (for misusing the fear to the students by violence and brute force).

It was then revealed that he’s mastermind behind Class 3-E poisoning incident at Okinawa. After he left the school, he was mocked and teases by his upper-class superior that he lost to Nagisa. Unable to deal with the humiliation, he stole the office funds and hired professional assassins to poison the students in Okinawa. Before the reveal, he spoke in the P.A. system that he has the antidote and wants Nagisa and Kayano to bring Koro-sensei to him. His identity was revealed when Karasuma suspects some of the bodyguards were part of his department and the sudden stolen funds that only a member of the department could stole it. He reveals to everyone that he plans to kill Koro-sensei by filling the anti-sensei bullets in the bathtub, tying up Kayano and buried BOTH of them in the cement; letting Koro-sensei dissolved since he can’t kill his own students. Inhuman, he even threaten that he’ll blow up the antidote by forcing him to fight Nagisa and paying him back for every humiliation he did to him. Despite Nagisa did as he was told, he blows it up; madly laughing to see his expression as he breaks his promise.

Both fights against each other (with the help of Terasaka’s stun gun and motivation) and he gains the upper hand. He tells him once he wins he’ll kill him and use his arms and legs as decoration. Sadly, Nagisa uses his new technique and defeats him for the second time and blow up whatever left of his sanity. He doesn’t even suspect that his assassin has double-crossed him by giving a fake poison when he reveals that he has no intention of giving the students the antidote at all.

He was last seen being dragged away by the officers and was interrogated for his actions.

Quotes

 * "To bring students under your thumbs, you have to give them just two things. Affection and Fear"
 * (To Class E Students) "What naughty children..., you came to see your respected instructor, and you come through the back entrance. Papa would never have instructed such children. Guess i have no choice. I'll give you guys supplementary lesson for your summer vacation!"

Trivia

 * Ryoma Terasaka was called "Pseudo-Takaoka" during class 3-E training using code names.