|This article is about a/an villainous army in Engine Sentai Go-Onger.|
|Banki Clan Gaiark|
|Led by:||Pollution President Batcheed|
|and later by:||Pollution President Babatcheed|
|Generals and other Notable Members:||Yogoshimacritein, Yogostein, Kegalesia, Kitaneidas, Hiramechimedes, Kireizky, Chirakasonne, Chirakashizky|
|Monster Types:||Banki Beasts|
|Base:||Hellgaile Palace (Go-onger)|
Gunman World (Gokaiger)
|Other factions battled:||Space Empire Zangyack|
|Teamed up with:||Meka|
The Banki Clan Gaiark (蛮機族ガイアーク, Bankizoku Gaiāku, "Barbaric Machine Clan Gaiark", with "Gaiark" being the portmanteau of "noble" (貴族 kizoku) and "harmful" (害悪 gaiaku)) are the antagonists from Engine Sentai Go-Onger. They are machine-men from Machine World who are last of their kind and filled with the desire to pollute the Earth.
Originally thought to be the last of their kind, the three Pollution Ministers ended up on Earth, known to them as the Human World, and decide to pollute it to serve as an ideal paradise for them. To that end, the Pollution Ministers uses the Deus Haguru Magear (デウス・ハグル・マギア Deusu Haguru Magia?), a big gear Yogostein brought with him, to create Hellgailles Palace (ヘルガイユ宮殿 Herugaiyu Kyūden?) on an isolated island in the middle of the sea. But over time, it is revealed that the Gaiark's more powerful members have been acting on other Braneworlds. After the defeat of Yogoshimacritein and his forces, the remaining Gaiark exist within Gunman World.
Main Article: Pollution President Batcheed
Main Article: Pollution President Babatcheed
Main Article: Crime Minister Yogoshimacritein
Main Article: Cleaning Minister Kireizky
Main Article: Danger Cabinet-Director Chirakasonne
Main Article: Land Pollution Minister Yogostein
Main Article: Water Pollution Minister Kegalesia
Main Article: Air Pollution Minister Kitaneidas
Originally thought to be the last of the Gaiark, the three Pollution Ministers ended up on Earth and decide to pollute it to serve as an ideal paradise for them. Though the most reoccurring of the Go-Ongers' enemies, the Pollution Ministers are not truly evil. In the end, while their friend Yogostein died fighting, Kegalesia, and Kitaneidas sacrificed themselves to aid the Go-ongers against Yogoshimacritein. Reunited after death, the Pollution Ministers have no more reason to attack people as the Sanzu River proved to be an ideal paradise for them.
Main Article: Land Pollution Vice-Minister Hiramechimedes
Water Pollution Prince Nigorl zo Arelunbra
Water Pollution Prince Nigorl zo Arelunbra (害水王子ニゴール・ゾ・アレルンブラ, Gaisui Ōji Nigōru zo Arerunbura, 26): Prince of the Arelunbra, a fencing master of the Nigorl Rapier (ニゴールレイピア, Nigōru Reipia) and able to summon rain clouds.
Nigorl ended up on Earth in suspended animation after Kegalesia turns him down, due to the fact that he has an unusual liking to things he considers beautiful which contradicts the Gaiark's taboo on the word "beauty." Though revived, Nigorl's affections turn from Kegalesia to Engine Bear RV as he attempts to marry her. But after the team regains Bear RV from him, Nigorl is mortally wounded and left to die by Kegalesia.
While fighting, Nigorl's stronger ability is the Water Pollution branch's trademark Water Pollution Fusion, using it on Kegalesia and mass amounts of water to enlarge into a giant without need of Bikkurium and having Kegalesia interfaced in his systems as a battery to increase his power. In this state, referred as Mix Kegalegorl (ミックス・ケガレゴール, Mikkusu Kegaregōru), Nigorl's attacks are Kegalegorl BeBeBeBeam (ケガレゴール・ビビビビーム, Kegaregōru Bibibibīmu) and Kegalegorl ThunThuThunder (ケガレゴール・サンササンダー, Kegaregōru Sansasandā). His name is from the Japanese word for "to get impure" (濁る, nigoru).
- Banki Soldiers Ugatz (蛮機兵ウガッツ, Bankihei Ugattsu): Android footsoldiers built to support the Banki Beasts and pilot the Barbaric Dohmas. Hiramechimedes later upgrades them with his screws.
- Barbaric Dohma (蛮ドーマ, Bandōma): Moth-like jet fighters which can assume a frog-like walking mode. Though normally used by the Ugatz, the Pollution Ministers piloted their own Barbaric Dohmas before escaping to Earth.
- Barbaric Dohma SP (Special) (蛮ドーマＳＰ, Bandōma Supesharu) Mantis-like jet fighters that serve as Hiramechimedes' personal transport, each able to hold up to four Barbaric Dohma on itself to resemble a classic WW1 airplane.
Main Article: Barbaric Machine Beasts