While transformed, they each carry a Mantan Gun and wield unique Go-on Gear (ゴーオンギア, Gōon Gia) weapons.
The primary members composed of Sōsuke, Renn, and Saki utilize blue-colored Change Souls in conjunction with the Go-Phone (ゴーフォン, Gōfon) in order to transform.
With the Bridge Axe, Cowl Laser, and two Rocket Daggers, they can perform the Go-on Bond Spirits (ゴーオンキズナスピリッツ, Gō-on Kizuna Supirittsu) finisher.
[1] Inversely, the secondary members composed of Hanto and Gunpei utilize green-colored Change Souls in conjunction with the Shift Changer (シフトチェンジャー, Shifuto Chenjā) brace in order to transform.
With Geki Red and Rio, he can perform the Geki-Rin Engine Bullet (激臨炎神弾, Gekirin Enjin Dan) attack.
Saki Rōyama (楼山 早輝, Rōyama Saki), nicknamed the "Sweet Angel", was a concessions vendor who worked the stands of the Twin Ring Motegi racetrack and is known for cheerful, eager personality, which stemmed from an encounter with a woodland spirit who taught her to always "smile, smile".
Hanto Jō (城 範人, Jō Hanto), nicknamed the "Vagabond", is an enthusiastic, kind-hearted, but immature freeter working part-time at the Doki Doki Pizzeria who became a Go-onger after helping Gunpei Ishihara return the original Go-ongers' Engine Casts.
After witnessing the original Go-ongers during their initial battles with Gaiark, Gunpei quits the police force after they refuse to help.
Upon discovering the Go-ongers' identities, he goes to extreme lengths to join them, going so far as to kidnap their ally, Bomper, and steal their Engine Casts.
The Go-on Wings (ゴーオンウイングス, Gōon Uingusu) are an elite two-man fighting force composed of the Sutō siblings, who came from a Plutocratic lifestyle.
After defeating the Gaiark Clan, they resume their familial duties as members of high class society, though Hiroto was reluctant to do so.
During the events of the crossover film Engine Sentai Go-onger vs. Gekiranger, it is revealed that the Go-on Wings learned the Geki Jūken Beast Arts fighting style from Gorie Yen.
Unlike the primary or secondary Go-ongers, the Sutō siblings utilize red-colored Change Souls in conjunction with the Wing Trigger in order to transform.
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 Hellgailles Palace (ヘルガイユ宮殿, Herugaiyu Kyūden), which is powered by the Deus Haguru Magear (デウス・ハグル・マギア, Deusu Haguru Magia), an inexhaustible energy source that Yogostein brought with him from Machine World.
!, 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.
Land Pollution Minister Yogostein (害地大臣ヨゴシュタイン, Gaichi Daijin Yogoshutain),[33][k] short for Baron Yogorex de Stein (バロン・ヨゴレックス・ド・シュタイン, Baron Yogorekkusu do Shutain), is a serious-minded general who leads the Gaiark's Land Pollution Barbaric Machine Beasts and wields the Yogospear (ヨゴシュピア, Yogoshupia).
Water Pollution Minister Kegalesia (害水大臣ケガレシア, Gaisui Daijin Kegareshia)[32][m] is the leader of the Water Pollution Barbaric Machine Beasts who is armed with the Kegastick (ケガスティック, Kegasutikku), possesses regenerating artificial human-like skin, and can shoot steam from pipes on her back whenever she gets angry, which can cause her to enlarge if excess steam is produced.
Amidst the Gaiark's fight with the Go-ongers, Kegalesia briefly breaks off from her fellow ministers to form the G3 Princess idol group to defeat a separate foe.
[35] 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 Kega Yellow (ケガイエロー, Kega Ierō).
Land Pollution Vice-Minister Hiramechimedes (害地副大臣ヒラメキメデス, Gaichi Fukudaijin Hiramekimedesu)[n] is Yogostein's subordinate and the Gaiark's top tactical genius.
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 Detaramedes (デタラメデス, Detaramedesu).
Crime Minister Yogoshimacritein (総裏大臣ヨゴシマクリタイン, Sōridaijin Yogoshimakuritain)[q] is the Gaiark's Insurgent Highness (デンカノボウトウ, Denka no Bōtō) and Yogostein's father who wields a two-headed Kanabō-like weapon.
He destroys his traitorous subordinates and utilizes the Third Industrial Revolution (第三次産業革命, Daisanji Sangyō Kakumei) ability to enlarge himself, but is scrapped by EngineOh G12.