Disciple of Acacia, a Gourmet Hunter of legend, and the worlds greatest and most skilled master of "Knocking".
Before Jirou was a disciple of Acacia, he was known as Rampaging Beast "Jirou", who was known for his brutal personality along with his massive strength, however; Acacia sealed a part of Jirou's strength and taught him knocking techniques as well as adopting Jirou into his family. Acacia's teachings and influence changed Jirou's personality and after he mastered knocking techniques he became known as Knocking Master Jirou. During his time with his master Acacia he lived with his family, which consist of Acacia, Frohze, Ichiryuu, and later Midora. After a certain period of time since Midora joined the family, Jirou formed a combo with Setsuno.
Jirou is created by Mitsutoshi Shimabukuro as one of the three disciples of the legendary "Gourmet God" Acacia. Any inspirations that were used by the author for Jirou's character design and name are currently unknown.
Jirou was first shown in his "old man mode", which he appears as a drunken and hunched old man with a pompadour hairstyle and goatee. When Jirou is in his "old man mode" he usually has on ragged clothing and sandals that when combined with his physical characteristics of a small and weak old man makes him look similar to a hobo. Jirou has also been shown to be able to increase his muscle mass with knocking to gigantic sizes. Later on in the series, Jirou saves Toriko from the dangers of Gourmet World in a different appearance then before. His new appearance made him look make younger with his hair turned black and with his body being well-built. He also had a change of clothes and wore a tight black jumpsuit with bandages around his waist and right arm with a blue leather vest, which hold his knocking equipment. During his youth, Jirou's body was muscular and he wore his famous blue leather vest that had nothing underneath it along with shin length pants followed by black scandals.
Before the title of "Knocking Master", Jirou had the previous title of "Rampaging Beast" Jirou, which he earned with his overwhelming strength and brutal personality, but after Acacia's influence, Jirou was able to change his personality. As a young man Jirou express great pride in his abilities as well as being a joker. Jirou enjoyed teasing people, mostly his brothers Midora and Ichiryuu, but Jirou himself is easily irritated when he gets teased and annoyed when face with a serious attitude. Jirou also cared very deeply for his adoptive family.
Jirou is shown to be a very kind hearted drunk in the start of the series to the point that booze was life to the man and that anyone who gave him booze he would in return give his eternal gratitude to them. Jirou is also an extremely unselfish individual, since he never seeks a reward after helping someone and will gladly share his precious booze with others. Teppei, one of Jirou's younger blood relatives, viewed Jirou as a joyful and mellow person who almost always as smile on his face, so when Teppei saw the pain in Jirou's face from the sight of a hunting ground stripped of life, it became the greatest influence for Teppei to became a Saiseiya. Even though Jirou is typically a happy person, in times of trouble or preparing for something he can get very serious to the point that he stops drinking booze and can demonstrate a very aggressive personality.
Jirou formed a combo with Setsuno during his time with his adoptive family and together they hunted the ingredients of the world. Their relationship seems to be very close and they share very fond memories with each other, which is indicated by having the same ingredients for both of their full course menus along with Setsuno's blushing when ever she mentions their past. They still seem to share a special connection with each other, which was shown when Jirou saved Setsuno and called her "his dear Secchan" and she in return called him "Jirouchan".
Teppei Is a blood relative to Jirou and had a close relationship with Jirou since he was a child. Jirou is the one who took care of Teppei and trained him, including teaching him knocking techniques. It was also Jirou's love for ingredients that inspire Teppei to became a Saiseiya, in order to save the environments and ingredients of the world because it was Jirou's sad face when he saw the destruction of one of his favorite hunting grounds that gave Teppei his reason to save ingredients. Jirou still cares deeply for Teppei and was greatly upset when he saw Teppei attacking him during Cooking Fest.
After Jirou's powers were sealed by Acacia, Acacia became Jirou's mentor, who taught him knocking techniques, and also adopted Jirou into his family and became his adoptive parent alongside Frohze, Acacia's combo partner. Both of them had another child, who they had adopted before Jirou, named Ichiryuu. The two brothers formed a sibling rivalry where they competed and fought against each other, but Jirou was no match for his older, regardless; Ichiryuu's kind nature caused Ichiryuu to give his brother the win in the end. Later on the family adopted Midora. Jirou would usually teased Midora and in turn Midora would tease Jirou, which usually ends up with them fighting one another, which is stopped by their older brother Ichiryuu. The family lived with each other for many years before the start of the Gourmet Age.
Jirou was on a train to Gourmet Fortune because he wanted to go to the Cave of the Sandy Beach to caught Puffer Whales, while on the train he ran out of booze, since Toriko brought it all. So Jirou asks, in a kind and drunken fashion, if Toriko can share some of his booze with him. Toriko decides to give Jirou booze, which Jirou promise that he would pay him back for his kindness. Later when Komatsu was in danger of getting eaten by Devil Serpent, Jirou saved him by knocking the Devil Serpent in his giant form. Komatsu's life was still in danger from his misuse of a Toriko Cracker, which had stopped Komatsu's heart from beating and destroyed his eardrums. So Jirou used his knocking gun to kick start Komatsu's heart and the use another one of his gadgets to fix his ears. Afterwards Jirou proceeds to leave the cave with a bag full of Puffer Whale.
The first time Toriko enters Gourmet World his combo partner Komatsu feared the danger that Toriko would face and called Jirou and asked him to help Toriko should something happen to him. Jirou then arrives in Gourmet World just in time to save Toriko from a pack of hundreds of Mamews using his knocking guns. Soon after Jirou takes care of the Mamews, two Gourmet creatures, the Asura Tiger and King Lander, appeared and Jirou used his Ikaku Knocking to scare them away and frightened Toriko as well. Jirou and Toriko sit down and Jirou talks to Toriko about the dangers of Gourmet World. He tells Toriko that Gourmet World is so difficult that Jirou himself must refrain from drinking, so that he would be able to take care of himself while he is in Gourmet World. Jirou also reminds toriko to have more faith in his partner Komatsu and Toriko promise to train even harder, so that one day he is strong enough to enter Gourmet World with Komatsu.
While the battle at Cooking Island was getting fiercer by the second, Jirou was found by the Four Heavenly Kings’ animal companions, Terry, Kiss, and Quinn, who told Jirou about the battle that is currently taking place on Cooking Island. Jirou for some unknown reason was able to understand the message that Terry, Kiss, and Quinn was saying and went with them to Cooking Island, however: on their way to Cooking Island they were stopped by a wild Hammer Tusk. Jirou then recognize the Hammer Tusk as a beast that Jirou himself had already defeated. Jirou then conclude that there was only one person with the skill to revive the Hammer Tusk and that it was none other than the renown saiseiya, Mohyan Shaishai. Jirou then uses his skills to tame the Hammer Tusk and uses it as a ride to Cooking Island with Terry, Kiss, and Quinn accompanying him.
Cooking Island was talking a turn for the worst with the arrival of Joa and Teppei. Teppei, who’s personality was change by Joa, Zebra attack them because he feels that they “gotten cocky”. Teppei was able to stop Zebra’s attack and then imprison him with tree roots. Then Two Nitro attack Joa because their instincts sensed how dangerous he is and Joa use taste change to gain control the Nitro. Setsuno confronts Joa and as a result Joa attacks Setsuno, who was force to use her kitchen knife to defend against the attack, which result with Setsuno gaining minor injuries. Afterwards Joa use a dark technique, which brought the Nitro that were just defeated by Zebra. Not only did the Nitro come back to life, but also on top of that brought them back stronger than before. The newly revive Nitro attack Setsuno and before she can react, she gets pin down by Teppei’s binding trees. The Nitro attacks come close to Setsuno, but is stop by Jirou, who flick the Nitro’s head right off.
Jirou then apologies to Setsuno for taking so long and suddenly his conversion with Setsuno is cut short by Teppei’s binding trees, which caused Jirou to yell “what are you doing” to Teppei and the power of the yell stops Teppei. Joa comments on how the Nitro are able to fight for months even without a head, but because Jirou knocked the Nitro, it could no longer move. Joa continues by talking about Jirou’s past as the “Rampaging Beast”. Jirou asks Joa “who are you” and Joa responds by calling Jirou a drunk and asks if Jirou would like to join their organization. Jirou follows up by asking Joa “re you an idiot?” Jirou then uses Grand Knocking to knock everyone. Zaus is shock that Jirou’s Knocking range was that of the whole Island, but Yuda tells Zaus that it was not such a cute little range like the island, but the whole planet itself. A massive natural disaster shows up following Jirou’s Grand Knocking and it dwarf Cooking Island and the surround islands. Joa comments that Jirou nearly stopped the rotation of the planet. Jirou replies by removing Joa’s disguise and is shock to see the face of Frohze.
Frohze jumps into the air and uses “God Cooking” to release an attack that destroyed the natural disaster. Setsuno then asks Jirou to attack together to confirm if that is really Frohze. They attack with both of their techniques, Setsuno’s Cooking Road and Jirou’s Guiness Punch. Joa stops both of their attacks and reveals to Jirou that she had perfectly mastered her gourmet cells, which means that she had eaten Acacia’s full course. No one besides Acacia and Frohze had eaten the course, which made Jirou believed that they were fighting the real Frohze, but Setsuno told Jirou that it was not the real one. Setsuno remembers how Frohze looked when she transform when she used her cooking technique and that the faces were different. She also points out that the real Frohze is dead. Jirou then wonders who then were they facing when Starjun shows up.
Starjun comes in on the back of a flying beast with an unconscious Komatsu under his arm. Joa asks Starjun if he would give Komatsu to him now, which Starjun told her that he wouldn’t hand over Komatsu. Suddenly, Jirou’s button pop off his jacket and foreshadows that something bad was going to happen soon. Starjun then shows his newly awaken cells that he acquire from his battle with Toriko. Joa decides that he is at a disadvantage with too many strong opponents for Joa to attempt to take Komatsu by force. Then the shy turn dark and Joa responded by saying that another battle was over. Starjun then tells Jirou to release his knocking because the spice is going to fall and kill everyone. Jirou agrees and release his knocking. Satrjun then tells Grinpatch to leave with him, meanwhile Joa also leaves with members of Neo. The spice begins to fall down on Human World and Jirou acknowledge that Midora had beaten Ichiryuu.
After the spice had fallen on Human World and left the world in a terrible state, Toriko was still depress about his defeat to Starjun and that Komatsu was taken from him. Jirou goes and sit down with Toriko once again to tell him that Ichiryuu had died. Jirou then drinks Ichiryuu’s favorite alcohol and Jirou tells Toriko that he does not like the drink at all too much. Jirou told Toriko that besides Ichiryuu being the strongest person that Jirou knows, that he was also the kindness person he knows. Jirou told Toriko about how when they were younger he would always get beaten up whenever he and Ichiryuu fought, but because of his kindness he would always give Jirou the win. Toriko tells Jirou that Ichiryuu never let Toriko win once and Jirou tells him that Ichiryuu only did that because he probably thought that toriko would one day beat him because of his potential. Toriko thinks that he is too weak because he lost and Jirou tells him to stop worrying about the past and look towards the future. Then Jirou asks Toriko what is his dream, which Toriko was unsure about, and Jirou told him that his past would light the way to his future.
Acacia is known as the “God of Bishokuya” since he was the greatest bishokuya in history and was Ichiryuu, Jirou, and Midora’s master. Each of Acacia’s students goes on to became legends of their own and that together they are consider to be the three most powerful people in the world. Unlike the other two disciples, Acacia was concern about Jirou’s strength, so he sealed it and taught him knocking techniques. After his training with his master, Jirou masters knocking techniques and becomes the “Knocking Master”.
Knocking is the capture method of stopping the movements of a prey, without talking the prey’s life, in short non-lethal paralysis. Knocking usually involves hitting the nerves or pressure points in the victim’s body that have control of the movement of the body. It should be noted that the location of the nerves are different for every species, so a person needs to have a great deal of knowledge and experience with knocking techniques in order to use knocking as a regular method of hunting. Knocking can be applied with equipment or one’s body and in Jirou’s case-intimidation. Knocking can also be used on both living and none living targets. Knocking can also be used on the user’s body in order to increase the body size and strength.
Jirou’s skill with knocking techniques is so far the best in the series. Jirou has shown to be able to use various knocking equipment that requires a great deal of skill effortlessly. Jirou has also shown to use knocking on himself to increase his muscle to gigantic sizes. He can also use his knocking ability to revive people and use knocking with his intimidation Jirou’s skill is to a level where his knocking range can affect the entire planet and almost stops the rotation of the planet with a single technique.
Membrane Tool: Can be use to repair damage membranes.
Knocking Rifle-Hard Type: A high tech knocking gun
Wolf’s King’s Fangs: A type of brass knuckle that Jirou can use to combine his appetite energy with in order to produce attacks such as Rising Wolf Guinnesss Punch.