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"I will now execute justice."
— Akoya Seishu, dishing out his brand of "justice"[2][5]

Akoya Seishu ( () () () (せい) (しゅう) , Akoya Seishū), also known as The Executioner ( (しょ) (けい) (にん) , Shokei-nin), is a police inspector and the captain of the 44th Riot Squad. He is also a secret vigilante that ruthlessly carries out his brand of justice.[2] He is also the affiliated fighter of Wakasa Life Insurance in the Kengan Matches and represented the company during the Kengan Annihilation Tournament. Two years later, he was scouted for the Kengan Association VS Purgatory Tournament as a representative for the Kengan Association.


Akoya Seishu is a bulky muscular man with an angular head, sharp facial features and cheekbones, focused eyes, thin black eyebrows, and black hair gelled backward into backward-facing spikes. During his bouts in the Kengan matches, he wears a white Karate gi adorned with a black belt with black shorts, usually with a black tank-top underneath.

His police wear consists of a white dress shirt and black trousers fastened with a leather belt.

During his one-man police raids, he wears a full suit of bulletproof armor over a bodysuit, paired with a circular glass visor.


Akoya is a man who is driven almost entirely by his intense brand of justice. He thoroughly judges evil: no matter how seemingly insignificant the crime, even in hindsight, Akoya executes those he deems guilty without mercy. Because of how mercilessly ruthless and indiscriminate he is when executing his justice, he takes it upon Hiyama Shunka to somewhat curb his tendencies by directing his actions. Adam Dudley likened his vigilantism to Dirty Harry syndrome.[5]

Two years later, his violent nature and twisted sense of justice have seemingly retained their intensity, with Akoya even being given a Kengan match suspension for attempting to murder his opponent in those two years.[6] Hiyama noted that through his drive to become stronger, Akoya has brought himself closer to "death".[7]

Even with all his ruthlessness, Akoya is not above having "allies" to help him. While Hiyama is a means to an end, upon evaluating him, Akoya also possesses a vested interest in Gaoh Ryuki as a potential ally. It's implied that it's due to both of them sharing a misguided bloodlust towards those they deem unworthy of life, with Akoya "executing justice" on "sinners" and Gaoh "exterminating" members of the Worm, who are nothing but "pests" to him.


Kengan Ashura

Akoya was first seen naked in Hiyama Shunka's quarters, asking her how long it was till they would arrive at the island. Hiyama replied with inhuman accuracy, adding that it was strange for Akoya to act so excitedly, but he replied that he would soon get to enact his justice.

During their first day on Ganryu Island, after Hiyama spotted someone flailing in the sea, she told Akoya to save them but soon found out it was none other than Yoshitake Yoshiro.

On the first day, Akoya represented Wakasa Life Insurance in the Kengan Annihilation Tournament. Aided by Hiyama, he fought against Kono Haruo in the first round. With Hiyama's aid failing him due to Haruo's changed pattern, Akoya was put on the back foot. Dismissing her aid, Akoya went on his own, brutally knocking Haruo out with a powerful kick to the face. After the fight, he slapped Hiyama for her failure, telling her that he would fight alone in the next round. Pleading for him not to leave her, Akoya merely wiped the blood from Hiyama's face and warned her not to let it happen again.

In the second round, Akoya fought against Imai Cosmo. Initially dominating with the aid of Hiyama, he was put in an incomplete chokehold by Cosmo after Hiyama was dispatched by Nishihonji Akira. Informing Hiyama of her failure, Akoya went solo and viciously brutalized and tortured Cosmo, much to the audience's horror. However, Cosmo got a second wind and eventually ended up narrowly defeating Akoya. After their fight, when Cosmo came to acknowledge his strength, Akoya slapped away Cosmo's hand and stormed off with Hiyama in two.

Later, during Hayami Katsumasa's revolution, Akoya was seen ruthlessly taking down Guardians that were opposing him. With Kanoh Agito coming alongside him, the two prepared to subdue the offending Guardians.

Akoya and Hiyama watched the rest of the tournament unfold by themselves.

Kengan Omega

Around 18 months after the Annihilation Tournament, Akoya was given an indefinite suspension from the Kengan matches for intentionally trying to murder Murobuchi Gozo and putting him into a coma.[6][8]

At the metropolitan police department, Akoya looked over the surveillance footage regarding the death of Yuzaki Mumon and saw a familiar-looking face, which he pondered whether it was a coincidence for newcomer Gaoh Ryuki to be near the scene of the crime.

Sometime later, Akoya tried trailing Ryuki, with heightened caution on his end, but the latter still noticed him. However, following Ryuki's trail led him to find the corpse of an employee of a Kengan Association company.

Later, when he was going over the recent murders of employees from Kengan Association companies and the revelation that the corpses belonged to people impersonating them, Akoya mused on how far the issue went, noting his only clue was the centipede tattoo all the victims had. Having set up a Kengan match between two friendly Association members, he pronounced judgment upon Ryuki.

On the day of his return to the Kengan matches, Hiyama arrived and told him it was time for his fight. Before his match with Ryuki, Akoya shared his extreme views with his opponent before walking into the arena. On his way, he told Hiyama that he was going in for the kill to ascertain Ryuki's true nature. As the match started, though Ryuki attempted to end the match quickly, Akoya immediately took the upper hand, blocking Ryuki's strike and hitting with his own. Bored with Ryuki's repeated use of Earth-Crouching Dragon, Akoya swatted him away and told him to get serious.

With Ryuki throwing a new technique at Akoya, which he narrowly dodged, Akoya went on the offensive and eventually floored Ryuki before relentlessly pummelling him. With Ryuki hesitating, Akoya continued whaling on him until he Katahara Metsudo's Bodyguards forcefully restrained him. With Akoya victorious, he asked Ryuki why he hesitated before leaving. Walking back to Hiyama, he grinned ecstatically, jubilant that he had found a "comrade" in his quest for justice.

While on the plane traveling to Mt. Godslayer, Akoya approached Ryuki, only to be promptly dismissed. Akoya was then approached by Wakatsuki Takeshi, who confronted him over him brutalizing Murobuchi Gozo. Akoya merely replied that he would execute justice upon Takeshi too, one day. Before the first match of the tournament, Kure Raian goaded Akoya into an argument that threatened to escalate. It was upon Kaolan Wongsawat abruptly taking the initiative that their altercation ceased.

After Naidan Mönkhbat's death in the fifth match, Akoya entered the ring with Kure Raian, Ohkubo Naoya and Tokita Ohma to protect Gaoh Ryuki from Liu Dongcheng. While going back to his team's gate, Akoya silently approved of Ryuki killing Naidan.

Before the ninth match of the tournament, with five matches remaining, Akoya was sent out to fight against Nicolas Le Banner at Takeshi's request, reasoning that if he wasn't sent sooner, they might be forced to rely on him as the tiebreaker. Dismissing Nicolas' banter, Akoya was then slapped by him, before blocking an attack that suddenly numbed his shield arm.

When his arm started working again, Akoya held his own against Nicolas' attacks, before suddenly losing vision from his left eye and getting hit in the face. Recognizing Nicolas' numbing attacks as nerve strikes, Akoya was still struggling to keep his defenses up against Nicoals. Eventually, Akoya snapped and viciously bit Nicolas in the shoulder.

In an increasingly violent and potentially lethal match between the two, Rolón intervened once the referee decided to end the fight. Unwilling to listen to Rolón, both Akoya and Nicolas were subdued. In Akoya's case, he was restrained by Lihito, while Carlos Medel knocked him out with a swift punch to the jaw. With their match declared a no contest, both Akoya and Nicolas were to be in custody until the end of the tournament. Once he regained consciousness he's seen regreting not being strong enough to "execute justice".

Power & Abilities

Akoya uses Taiho-jutsu ( (たい) () (じゅつ) ; lit. "Art of Arrest"), an eclectic fighting style developed for use by police officers and intended to subdue opponents.[9] As such, he is described as having the strongest defense in the Kengan matches.[10] He has a device implanted in his skull that enables wireless communication with Hiyama,[11] where she can then use her superhuman timing and analytical ability to deliver instructions and pre-programmed combos for Akoya to use. Combined with his superhuman reaction speed, which is around 74 milliseconds,[12] this enables Akoya to react to Hiyama's commands almost instantly. However, these commands act as a moral and mental restraint for Akoya, allowing him to fight without killing his opponents. Thus, if Hiyama is too slow or becomes compromised, he will quickly revert to his original merciless fighting style.

His fighting style implements various techniques that, along with his brutality and relentlessness, psychologically break his opponents.

After his loss to Cosmo in the Kengan Annihilation Tournament, Akoya began vehemently pursuing greater strength to attain the invincible "power of perfect justice." Hiyama estimates that Akoya is stronger than when he worked in tandem with her.[7] Akoya's new strategy involves pinning down his opponent under his shielding forearm because, of all tactics that include using the shield, "pinning" is the only one with no perfect counter-measure.[8]


Akoya puts his left forearm forward as if he were holding a riot shield, then uses his shielding forearm to redirect any blows away from him, taking only minor damage rather than the full brunt of the attack. However, this doesn't completely disperse the attack's force and still puts stress on his shielding forearm.[9] Despite this, Akoya's arms possess an incredible level of durability and endurance, leaving him none the worse for wear after his fight with Haruo.


Ripper (リッパー, Rippā) is a technique that is aesthetically similar to Lihito's Razor's Edge, but has a different function and use. Rather than using inhuman finger strength, Akoya uses his knucklebones and a rapid rotation of his fists against his opponent's skin to cut through.[9] Though the resulting cut is shallow, the technique's true value is for Akoya to jab at the wounds during a fight to distract the opponent, giving Akoya an advantage. It is more of a harassment technique than a damage-dealing move.[9]

Stance of Suppression

Taiho-jutsu: Stance of Suppression ( (たい) () (じゅつ) (せい) (あつ) (かま) え, Taiho-jutsu: Seiatsu no Kamae):[13] A stance adapted from Kanoh Agito's stance and modified to fit Akoya's build, personality and fighting style. It is specialized for attacking in conjunction with Hiyama's commands.

Notes & Trivia

  • Akoya's favourite word is "justice" and his favourite food is natto.[1]
  • His character motif was inspired by crime fighters from American comics, such as Rorschach and the Punisher.[1]
  • Akoya's theme in the anime is Mangekyō by RagDöllz.


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United Clothing Murobuchi Gozo · Yanagi Makoto
Ushitami Food Services Nabe Mikio · Yokota Masayasu
Village of the Dawn Yoroizuka Sanemitsu · Yoroizuka Saw Paing
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