Bomper , short for "Born-to Outerdimension and Mechanic × Pitcrew-type ENGINE-support Robot", is a pink radar
robot from Machine World who was created by Jum-bowhale and supports the Go-ongers by creating their arsenal and performing maintenance on the Engines. Bomper is voiced by .
Gaiark The , are
machine-men from the Machine World who seek to pollute the Braneworlds and whose numbers were scattered during their war with the Engines.
Pollution Ministers Originally thought to be the last of the Gaiark, the three Pollution Ministers end up on Earth to
pollute it to serve as an ideal paradise for them and based themselves at , which is powered by the , an inexhaustible energy source that Yogostein brought with him from Machine World. Amidst their battle with Yogoshimacritein, the Go-ongers destroy the gear, causing Hellgailles Palace to self-destruct. During the events of the crossover film
Samurai Sentai Shinkenger vs. Go-onger: GinmakuBang!!, the Pollution Ministers are rebuilt, but choose not to continue the Gaiark Clan's plans and run off to the bottom of the
Sanzu River. As of the events of the anniversary film
Engine Sentai Go-onger: 10 Years Grand Prix, the ministers settle down in Junk World, but accidentally give rise to the Zontark Clan and join forces with the Go-ongers to stop them.
Yogostein , short for , is a serious-minded general who leads the Gaiark's Land Pollution Barbaric Machine Beasts and wields the . After suffering a string of failures amidst his battles against the Go-ongers and losing his vice-minister, Hiramechimedes, whom he had total faith in, Yogostein goes into self-imposed exile to mourn and find himself before returning to personally seek violent revenge against the Go-ongers. Desiring the Horonderthal Clan's power, he awakens one of its members, lets the Go-ongers scrap it, and uses its parts to upgrade himself into the Horonderthal King in a failed attempt to kill Go-on Red and rust all of Japan. Despite his newfound power, he is weakened by EngineOh G12 and scrapped by Go-on Red in a final duel. Kitaneydas is voiced by .
Kegalesia During the events of
Engine Sentai Go-onger: 10 Years Grand Prix, amidst the Pollution Ministers' efforts to stop the Zontark Clan, Kegalesia borrows Go-on Yellow's transformation equipment and briefly transforms into . Kegalesia is portrayed by .
Hiramechimedes is Yogostein's subordinate and the Gaiark's top tactical genius. Originally a second-rate inventor who developed much of the Gaiark's arsenal, he plotted to assassinate Yogostein and take his position. However, the latter recognized the former's brilliance and awarded him with the
yardstick-like sword and promoted him to Vice-Minister. This caused Hiramechimedes to loyally devote himself to Yogostein's cause and he would go on to inspire fear in the Engines after achieving numerous victories. On the day the Gaiark were expelled from Machine World, Hiramechimedes disappeared to mount a failed attack on the Wing Race before resurfacing in the Human World months later to serve under Yogostein once more. When the Wing Engines pursue him and gain help from the Go-on Wings, Hiramechimedes stages his banishment from the Gaiark in a plot to deceive the Go-ongers and kill Go-on Gold. When the heroes foil him, an ashamed Hiramechimedes refuses to return to Yogostein and spends several days calculating a new plan to kill the Go-ongers. Eventually concluding he needs raw power instead of his intellect, he sneaks back into the Hellgailles Palace and infuses himself with one hundred times the Bikkurium required for a regular Barbaric Machine Beast to undergo an Industrial Revolution. However, the stress of his upgrade breaks his mind as he undergoes a "Big Industrial Revolution" and transforms into the insane . He overpowers the Go-ongers, but is eventually scrapped by Go-on Red. Despite this, his grudge against the Go-ongers keeps him from passing on. Unable to retake physical form and referring to himself as , he travels to the Braneworld of Samurai World, possesses a monstrous inhabitant named Bakki, and transforms further into to take revenge on the Go-ongers, only to be exorcised by them. Hiramechimedes is voiced by
Kazuya Nakai.
Yogoshimacritein is the Gaiark's and Yogostein's father who wields a two-headed
Kanabō-like weapon. As the most ruthless member of the Gaiark Clan, he desired to rule over all of the Braneworlds, having oversaw the near-extinction of the Engines' Gian Race and the destruction of three Braneworlds. After Kireizky arrives in the Human World, Yogoshimacritein uses the former's Bottomless Wastebin to enter the Human World himself and use it to power his attack, which can convert targets into wavelengths so long as the Deus Haguru Magear is active. When he uses his ability to turn Kitaneydas and Kegalesia into his puppets and reveals his willingness to sacrifice them, the Pollution Ministers assist the Go-ongers in destroying the Bottomless Wastebin and the Deus Haguru Magear to weaken Yogoshimacritein. He destroys his traitorous subordinates and uses the ability to enlarge himself, but is scrapped by EngineOh G12. Yogoshimacritein is voiced by
Kiyoyuki Yanada, who also voices Yogostein.
Other members • : Preceding the Gaiark as the Engines' mortal enemies, the Arelunbra Family were sea-based androids who terrorized Machine World with their before their leader Nigorl left for the Human World and the Arelunbra faded into legend. • : A servant of Nigorl who wields a
jousting lance and shield with the ability to consume anything. After arriving in the Human World with Nigorl, Uzumaquixote became exposed to its clean surroundings, miniaturized, and trapped as a stone statue that a young Renn Kōsaka would find, assuming it to be a statue. In the present, the Gaiark and Go-on Wings discover and fight over the statue until Kegalesia revives Uzumaquixote and has him attack the Go-ongers. After ingesting Bikkurium and enlarging himself, Uzumaquixote is scrapped by SeikuOh, GunBirOh, and EngineOh. Uzumaquixote is voiced by . • : The prince of the Arelunbra who wields the , possesses mastery in fencing, and the ability to summon rain clouds. Unlike other Gaiark members, he displays a liking towards things he considers beautiful. After pining for and being spurned by Kegalesia, he arrived in the Human World, but entered suspended animation. The Gaiark revive Nigorl in the present, who turns his affections towards BearRV and attempts to marry her. Using his Water Pollution Fusion ability, he enlarges himself without Bikkurium and forcibly interfaces with Kegalesia to transform into , with Kegalesia as a battery to increase his power. Despite this, he is defeated by the Go-ongers and left to die by Kegalesia. Nigorl is voiced by . • : A clan of ancient, giant
clockwork Savage Machine Beasts that caused the
extinction of the dinosaurs on Earth 65 million years ago with their violence-inducing attack. The Ancient Engines battled the Horonderthal until they and an individual clan member were fossilized within a mountain. In the present, Yogostein seeks out the Horonderthal and eventually succeeds despite freeing the Ancient Engines as well. After Yogostein upgrades the Horonderthal with modern Gaiark technology, it defeats the Ancient Engines, but is scrapped by EngineOh G12 while Yogostein claims the Horonderthal's power for himself. • : A Gaiark minister who "cleans" the slate of Braneworlds he has visited to acquire a special form of energy called . He wields : the , the , the , which can be wrung out into the , the , the , the , and the . After destroying the Braneworlds of Sound World, Magic World, and as part of his quest, he arrives in the Human World to battle the Go-ongers until he loses his Wastebin. He ingests the Dokkirium he had collected and undergoes a to overpower the Go-ongers and Engines, but they form EngineOh G12 to defeat Kireizky. However, the Wastebin would later allow Yogoshimacritein to enter the Human World. Kireizky is voiced by . • : Yogoshimacritein's
boiler-themed right-hand and practitioner of the fighting style. Chirakasonne ingests Dokkirium and enlarges, but is scrapped by GunBirOh. Chirakasonne is voiced by .
Arsenal • :
Android foot soldiers built to support the Barbaric Machine Beasts and pilot the Barbaric Dohmas. Additionally, Nigorl possesses a feminine variant called , which are stronger than regular Ugatts. During the events of the crossover film
Samurai Sentai Shinkenger vs. Go-onger: GinmakuBang!!, Batcheed uses Ugatts capable of transforming into motorcycles. • :
Cave cricket-like jet fighters invented by Hiramechimedes that can assume a frog-like walking mode. • : Cave cricket and
mantis-like jet fighters that serve as Hiramechimedes and the Pollution Minsters' personal transports that are each able to carry up to four Barbaric Dohma.
Barbaric Machine Beasts The are monsters created by the Pollution Ministers to pollute the Earth and are, as such, usually divided into four types: , , , and . The Barbaric Machine Beasts are infused with a special energy called that is capable of enlarging them in a process called and are based on machines or inventions that were present at the turn of the twentieth century. If they are scrapped, the dead Barbaric Machine Beasts shrink back to normal size and end up at the Barbaric Machine Beast Graveyard. In the film
Engine Sentai Go-onger: Boom Boom! Bang Bang! GekijōBang!!, Yogostein takes advantage of this by developing the Barbaric Machine Beast program to use Ugatts souls to reanimate the Barbaric Machine Beasts into the , only for them to be re-scrapped by the Engines due to being much weaker than they used to be.
Land Pollution Barbaric Machine Beasts • : A
shovel-themed Barbaric Machine Beast equipped with shovel-like gauntlets. He is sent by Yogostein to attack Neo Tokyo Hills, only to be defeated by the Go-ongers. Scoop Banki enlarges, but is scrapped by EngineOh. Scoop Banki is voiced by . • : A
magnet-themed Barbaric Machine Beast capable of manipulating
electromagnetic forces. He is sent by Yogostein to attack the Go-ongers, who manage to defeat him. Following this, Jishaku Banki is upgraded into the
electromagnet-themed and uses his increased power to overwhelm the Go-ongers until Go-on Green destroys his power source. Denjishaku Banki enlarges, but is scrapped by EngineOh Birca. Jishaku and Denjishaku Banki are voiced by . • : A
boring machine-themed Barbaric Machine Beast sent by Yogostein to destroy Japan by extracting magma, only to be defeated by the Go-ongers. Boring Banki enlarges, but is scrapped by EngineOh and GunBirOh. Boring Banki is voiced by . • : An
electric generator-themed Barbaric Machine Beast who possesses electrokinesis. Following a mishap wherein he accidentally switches bodies with Go-on Red before the Go-ongers reverse the process, Hatsuden Banki enlarges, but is weakened by a cold that Go-on Red was suffering from and scrapped by EngineOh G6. Hatsuden Banki is voiced by . • : A
dynamite-themed Barbaric Machine Beast and Yogostein's "number one hooligan" with destructive capabilities. Yogostein sends him to destroy the city, but is foiled by the Go-on Wings. Despite receiving help from Yogostein and Hiramechimedes, Happa Banki is scrapped by Go-on Gold, who takes his Bikkurium to prevent him from enlarging. Happa Banki is voiced by . • : A
saw-themed Barbaric Machine Beast equipped with a saw blade arm capable of cutting through any material. He is sent by Yogostein to attack the city, but he focuses on attacking objects that are taller than him instead until the Go-ongers exploit the loose bolt holding his saw arm together. Nokogiri Banki enlarges, but is scrapped by EngineOh G6. Following this, Hiramechimedes collects his remains, rebuilds him into the stronger to remove his weaknesses, and tasks him with attacking the Go-ongers and Go-on Wings while polluting the skies. However, Jum-bowhale thwarts Chainsaw Banki's plans. The latter enlarges, but is scrapped by SeikuOh. Nokogiri and Chainsaw Banki are voiced by . • : A
spinning mule-themed Barbaric Machine Beast capable of firing streams of yarn to immobilize targets. She is tasked by Yogostein with aiding Hiramechimedes in staging a false attempt on his life. After undergoing an however, she is scrapped by EngineOh G9. Bōseki Banki is voiced by . • : A namesake-themed Barbaric Machine Beast that Yogostein infused with his hatred. As a result, the former is compelled to destroy everything in sight, to the point of disobeying Yogostein. Hammer Banki enlarges, but is scrapped by EngineOh G9 and the Go-Roader GT. Hammer Banki is voiced by . • : A namesake-themed Barbaric Machine Beast and the strongest of the Savage Land models who wields a drill horn. He is sent by Yogostein to locate the Horonderthal, only to accidentally awaken the Ancient Engines. Drill Banki enlarges, but is scrapped by KyoretsuOh. Drill Banki is voiced by .
Air Pollution Barbaric Machine Beasts • : An
incinerator-themed Barbaric Machine Beast capable of placing objects in his forehead furnace and converting it into smog for use in his attacks, with flowers and any objects he considers pretty improving the smog's toxicity. He is sent by Kitaneydas to use his abilities on Japan, but is foiled by the Go-ongers, forcibly enlarged by the Pollution Ministers, and scrapped by EngineOh. Shoukyaku Banki is voiced by . • : A namesake-themed Barbaric Machine Beast capable of converting beautiful sound waves into
noise pollution with his microphone spear before producing the resulting sound waves from his speakers. After receiving an upgrade that allows him to generate a sound barrier capable of blocking most attacks, Speaker Banki enlarges, only to be scrapped by EngineOh Gunpherd. Speaker Banki is voiced by . • : A
camera lens-themed Barbaric Machine Beast capable of teleporting targets to the Braneworld of Junk World and using the Braneworld's ability to mechanize people. Kitaneydas creates Lens Banki to assist in his plan to create new Ugatts. Despite enlarging and being scrapped by EngineOh and GunBirOh, Lens Banki takes pictures of the mecha, which the Pollution Ministers incorporate into Kagami Banki. Lens Banki is voiced by . • : A namesake-themed Barbaric Machine Beast capable of firing lasers and interfering with television signals and replacing them with his own hypnotic signals capable of forcing people to pollute their surroundings. He is sent by Kitaneydas to drive the Go-ongers apart, only to be thwarted by the latter. Antenna Banki enlarges, but is scrapped by GunBirOh. Antenna Banki is voiced by . • : A
vacuum cleaner-themed Barbaric Machine Beast. He is sent by Kitaneydas to kill the Go-on Wings, only to be defeated by them and Go-on Red. Vacuum Banki enlarges, but is scrapped by EngineOh Jetripter. Vacuum Banki is voiced by . • : A
balloon-themed Barbaric Machine Beast nicknamed the "Tiger of Balloons" who possesses a rubbery body that makes him immune to physical attacks, the ability to inflate targets, and weaponized smog-filled balloons. He is sent by Kitaneydas to distribute his balloons to children, but the Go-on Wings foil his plot. Fūsen Banki enlarges, but is scrapped by SeikuOh. Fūsen Banki is voiced by . • : A dowsing rod-themed Barbaric Machine Beast who wields a pair of
tonfa that double as dowsing rods. She is sent by Kitaneydas to locate an object that landed in the mountains and distract the Go-ongers while he uses the object to bury the Human World in trash. She enlarges, but is scrapped by EngineOh G9. Dowsing Banki is voiced by . • : A namesake-themed Barbaric Machine Beast who wields the batons. He is sent by Kitaneydas to cause heat waves and target Japan's gas tanks, only to be foiled by the Go-ongers. Heater Banki enlarges, but is scrapped by KyoretsuOh. Heater Banki is voiced by . • : A giant namesake/truck-themed Barbaric Machine Beast created to resemble EngineOh who possesses a
trucker-esque personality and the ability to transform into a gas guzzling
dekotora. He is sent by Kitaneydas to avenge Yogostein by polluting the Human World with his exhaust fumes. However, Engine Banki is shrunk by Go-on Gold and scrapped by Go-on Red. Engine Banki is voiced by . • : A namesake-themed Barbaric Machine Beast that Kitaneydas tasks with capturing children for the latter's plot to subjugate the world to endless festive fun before tasking him with capturing two boys from the Braneworld of Samurai World instead. Yatai Banki enlarges, but is scrapped by EngineOh, GunBirOh, and SeikuOh. Yatai Banki is voiced by . • : A namesake-themed Barbaric Machine Beast built to be the strongest of the Savage Sky models capable of polluting the air with carbon dioxide through his heavy breathing and aided by a pair of Ugatts who remotely operate his arms, which he cannot lift by himself. He enlarges, but is scrapped by SeikuOh and the Go-Roader GT. Dumbbell Banki is voiced by .
Water Pollution Barbaric Machine Beasts • : A drainage
pipe-themed Barbaric Machine Beast capable of producing sludge from his pipework body. Kegalesia sends him to test his powers at a dam before he enlarges to pollute Shindaiba, only for the latter to be scrapped by EngineOh. Pipe Banki is voiced by . • : A clumsy yet overeager
spray bottle-themed Barbaric Machine Beast capable of shooting acid from his mouth. He is sent by Kegalesia to steal Birca's Engine Cast, only to be wounded by his target and Gunpherd. Spray Banki enlarges, but is scrapped by EngineOh. Spray Banki is voiced by . • : A
gas cylinder-themed Barbaric Machine Beast capable of firing a Red Rust Beam. Kegalesia sends him to eliminate EngineOh, but is thwarted by Carrigator. Refusing to give up, he allows himself to be defeated to enlarge and try again, only to be scrapped by GunBirOh. Bombe Banki is voiced by . • : A
trigger-themed Barbaric Machine Beast who is reputed to be the Gaiark Clan's top sniper. Kegalesia sends him to capture an alien girl named Būkorin and bring her back to her father Gego in exchange for weapons, only to be defeated by the Go-ongers. Hikigane Banki enlarges, but is scrapped by EngineOh G6. Hikigane Banki is voiced by . • : A bath heater-themed Barbaric Machine Beast capable of shrinking and teleporting people to the miniature hot springs on his head via mist emitted from his nostrils. He is sent by Kegalesia to remove any interference to the Gaiark Clan's operations, during which he gains increased power after attaining enlightenment. Despite this, he is defeated by a love-filled Go-on Green. Kama Banki enlarges, but is scrapped by EngineOh G6. Kama Banki is voiced by . • : A namesake-themed Barbaric Machine Beast capable of producing slippery oil slick that can incapacitate normal vehicles and the land-based Engines. After being defeated by Toripter and Jetras, Hiramechimedes gives Oil Banki wings to combat them. Despite enlarging, EngineOh and GunBirOh use giant mops to scrap Oil Banki. Oil Banki is voiced by . • : A
manhole cover-themed Barbaric Machine Beast capable of moving at superhuman speed and shooting manhole covers. Kegalesia sends him to kidnap pen spinners as part of Kitaneydas' plan to power his Destructive Sound Machine and destroy the city. Manhole Banki enlarges, but is scrapped by EngineOh G9. Manhole Banki is voiced by . • : A
drinking straw-themed Barbaric Machine Beast capable of forcing targets to breathe out poisonous gas and three bottles that grant the ability to produce explosive soap bubbles, a smokescreen, and a bubble prison. Kegalesia develops a drink capable of enhancing his abilities and evil tendencies, but Straw Banki is defeated by Go-on Red and Speedor via the Go-Roader GT. Straw Banki enlarges, but is scrapped by BearRV, Bus-on, SeikuOh, and GunBirOh. Straw Banki is voiced by . • : A namesake-themed Barbaric Machine Beast created by Kegalesia with the intention of producing
acid rain, only to temporarily freeze men and sentient male organisms instead. Upon realizing what happened, Kegalesia gives Shower Banki "Super Ultra Gorgeous Acid Rain" and tasks her with killing the male Go-ongers, only for the latter to be defeated by Go-on Yellow and Silver and BearRV via the Go-Roader GT. Shower Banki enlarges, but is scrapped by GunBirOh Jetras and SeikuOh Gunpherd. Shower Banki is voiced by . • : A weak
bottle-themed Barbaric Machine Beast who can produce hot water. In light of his weakness, Kegalesia manipulates Manabu Yushima into upgrading Bin Banki into the magic-capable,
thermos-themed . After being depowered and enlarging however, Mahōbin Banki is scrapped by KyoretsuOh. Bin and Mahōbin Banki are voiced by .
Land/Water/Air Special Barbaric Machine Beasts • : A
mirror-themed Barbaric Machine Beast created by all three Pollution Ministers who is capable of reflecting the Engines' attacks via Lens Banki's pictures. After being upgraded with extra Bikkurium and enlarging, Kagami Banki is scrapped by EngineOh G6. Kagami Banki is voiced by . • : A draconic, chimeric Barbaric Machine Beast that Kitaneydas and Kegalesia modeled after all of its Barbaric Machine Beast predecessors, whose powers Kettei Banki is capable of using. Kettei Banki enlarges, but is scrapped by EngineOh, KyoretsuOh, and SeikuOh. Kettei Banki is voiced by .
Other Barbaric Machine Beasts • : A
microphone-themed Air Pollution Barbaric Machine Beast who is scrapped by EngineOh and appears exclusively in the special drama sessions of the first
Engine Sentai Go-onger soundtrack. • : A
sludge-themed Water Pollution Barbaric Machine Beast who is scrapped by EngineOh and GunBirOh and appears exclusively in the special drama sessions of the first
Engine Sentai Go-onger soundtrack. • : An
excavator-themed Land Pollution Barbaric Machine Beast who is scrapped by EngineOh G6 and appears exclusively in the
Engine Sentai Go-onger tie-in manga. • : A Barbaric Machine Beast who appears exclusively in the stage show . • : A namesake-themed Land/Water/Air Special Barbaric Machine Beast created by Rin Jūken Akugata engineer Meka capable of performing Ringi fighting techniques. After receiving the Dōkokugan Soul, Nunchaku Banki gains increased power until he is defeated by Go-on Red and Geki Red and possessed by Long. Nunchaku Banki is voiced by . ==Guest characters==