Akira Takaoka

Akira Takaoka is a trained soldier, a former ally of Tadaomi Karasuma and an early antagonist of the series.

When he was in the 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. It is assumed that Takaoka was never reported on due to the possible reprisals against any whistleblowers.

akaoka 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 them. He tells Class 3-E 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 give Class 3-E a hell schedule with no time to study. He knees Maehara and slaps Kanzaki when they object to his training and forces Karasuma and Koro-sensei to see his hellish method of training. His goal is to gain fame and popularity after one of the students kills Koro-sensei due to his training and gets to boss Karasuma around. After attempting to punch Kurahashi who calls Karasuma for help, Karasuma steps in and demands him 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 leave the school. Otherwise, Karasuma has to allow him to follow up with 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 actual plan was to avoid Nagisa's attacks and then beat him up so severely so that the students would have no choice but to obey him. Added, he also wants to see him in despair if he loses or forfeits the match. Unexpectedly, Nagisa casually walks towards him and subsequently pins him down with a knife in front of his throat. After regaining his composure, he openly refused to accept his loss and asks for a rematch. He finally snapped when Nagisa asked him to leave and was about to attack him before Karasuma elbows him in the face. To add insult to injury, Gakuho Asano came and fires him for to his actions and being an ineffective instructor who only used brute force to gain control of the class.

After he left the school, he was mocked and teased by his upper-class superiors for losing to a junior high student. Unable to deal with the humiliation, he stole 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 burying both of them in the cement; letting Koro-sensei dissolve since he can’t expand without killing his own student. Threatening to destroy the antidote, he challenged Nagisa to a one on one fight to the death, blowing up the ladder to the helipad he was on so no one could aid Nagisa.

Takaoka then had Nagisa prostrate himself for humiliating him and being the source of his frequent nightmares. After Nagisa had done so, Takaoka blew up the antidote anyway just so he could see Nagisa's frightened expression. As expected, Nagisa was filled with rage and picked up the combat knife, declaring his intention to kill him out of revenge. Despite Terasaka's attempt to cool down Nagisa by throwing his stun gun to him and some words, Nagisa appears to be goaded by Takaoka's words and continues to hold the combat knife while putting away the stun gun.

Both engage in a fight, though Takaoka easily overpowers Nagisa due to his build and experience, and the fact that he was prepared against Nagisa's attacks. Pausing halfway, he brandishes his own combat knife and tells Nagisa that once he wins, he will kill him and use his arms and legs as decoration. Unfortunately for him, Nagisa uses his stun gun after a well-feinted nekodamashi attack, immobilizing Takaoka and winning the fight. Following Terasaka's advice, Nagisa gave Takaoka a last jolt to his neck to knock him out, but not before giving him the smile Takaoka always saw in his nightmares, as a means of 'thanks'.

Takaoka never suspected that his hired assassins had double-crossed him by utilizing a weaker poison, due to him revealing to them that he never intended to give the antidote anyway. He was last seen being dragged away by the officers in restraints and was later interrogated for his actions.

And he is reprised by Justin Cook in the English dub and Kenta Miyake in the Japanese dub.