EPISODE TWO Pipe Banki Height: 220 cm to 55 m Weight: 247 kg to 617.5 t Savage Water Barbaric Machine Beast sent by Kegalesia. He is sent to pollute a dam, but is defeated by the Go-ongers. He then returns later to pollute the river in giant form, attacking the Go-ongers when he learned they didn't have their Engine Casts. They tried using their Highway Buster on him but it was no use. The three got their casts back and challenged Pipe Banki with EngineOh. He breaks a bridge where there is ongoing traffic, so EngineOh bridged the gape and the cars went over the robot. Unfortunately Pipe Banki didn't make it easy and knocked EngineOh off and caused one car to almost tetter off. Go-On Black and Go-On Green luckily saved the occupents of the car and Engine-Oh was able to destroy Pipe Banki, causing bubbles to emerge. Kegalesia was rather livid over his defeat.

EPISODE FOUR Spray Banki Height: 192 cm to 48 m Weight: 216 kg to 540 t A clumsy Savage Water Barbaric Machine Beast sent by Kegalesia to steal the Engine Cast of Birca. He can shoot acid from his mouth, which he does after counting to three. Kegalesia called spray Banki her own child. Kegalesia first showed herself to the others along with her beast. He was wounded by Birca and Gunpherd before Engine Oh destroyed him.

EPISODE SEVEN Bombe Banki Height: 209 cm to 52.2 m Weight: 235 kg to 587.5 tons A gas cylinder Savage Water Barbaric Machine Beast sent by Kegalesia, who fed lies for him to tell the Go-Onger. He could make any metal rust, including the main three Engines. Carry Gator was chasing after him and he made the Go-Onger believe he was an enemy. Bombe Banki was destroyed by the newly formed GunBirOh. Speedor, Bus-On, and BearRV remain rusted after he is gone.

EPISODE THIRTEEN Hikigane Banki Height: 213 cm to 53.2 m Weight: 263 kg to 657.5 t A trigger Savage Water Barbaric Machine Beast under Kegalesia, ranked as Gaiark's top sniper. He was sent to return Bukorin, Renn's new friend, to her father Gego. He called Gego 'Boss' and looked up to him. Hikigane was attacking randomly in Tokyo Tower, Gego told him not to attack strangers, but only his enemies. Using his various attacks, like "Water Magnum", Hikigane Banki overpowers the Go-ongers until Renn arrives to defeat him. He is destroyed by Engine-Oh G6, with his only regret not to see the Chunichi Dragons' winning streak one last time.

EPISODE FOURTEEN Kama Banki Height: 218 cm to 54.5 m Weight: 270 kg to 675 t He is a bath heater Savage Water Barbaric Machine Beast sent by Kegalesia, says 'Come On' in his sentences. Using a pink mist from his nostrils, Kama Banki teleports people into the hotsprings on his head where their cares are steamed away. In doing so, he is removing any interference in Gaiark's plan--which is humanity. A dojo owner is able to beat him, so Kegalesia goes to learn his secret. She tells Kama to stand under a waterfall and he reaches enlightenment in doing so. His power reaches zenith but he is defeated by a love-filled Hanto and Engine-Oh G6 with the wrong souls in different casts.

EPISODE SIXTEEN Oil Banki Height: 210 cm to 52.5 m to 55.1 m (with wings) Weight: 236 kg to 619.5 t to 619.5 t (with wings) Kegalesia's Oil Savage Water Barbaric Machine Beast who can create a really slippery oil slick on the city, incapacitating not only normal ground vehicles but also Engine-Oh G6. After being defeated by Toripter and Jetras, Hiramechimedes asks if he can take over Oil Banki, which Kegaleshia refuses to. Hiramechimedes upgrades Oil Banki, but he seemingly has no change. When in battle, Hiramechimedes grants wings to Oil Banki to fight the Wing Engines. But using mops to counter the oil slick, Engine-Oh and GunBir-Oh destroy Oil Banki.

EPISODE TWENTY-EIGHT Manhole Banki Height: 219 cm to 54.7 m Weight: 246 kg to 615 t A Savage Water Barbaric Machine Beast sent kidnap people that can spin ballpens as part of the Gaiark's place to power a machine to destroy the world. The Go-onger disguised to lure him. His signature move is "Grind Manhole", shooting out manholes at his enemies. He was eventually destroyed by Engine-Oh G9.

EPISODE THIRTY Straw Banki Height: 216 cm to 53.8 m Weight: 230 kg to 575 t A straw Savage Water Barbaric Machine Beast who can emit soap bubbles that explode on impact.