EPISODE TEN Kagami Banki Height: 215 cm to 53.8 m to 59 m Weight: 242 kg to 605 tons to 665.5 tons A mirror Barbaric Machine Beast created by all three Pollution Ministers. He tended to say "Mirror" in his sentences. Because of the pictures Lens Banki took before being destroyed, Kagami Banki can use the mirror on his chest to duplicate the Engines' attacks with his 'Mirror Effect.' Being recharged with Bikkurium took longer in his case because he was made by the three ministers. Kagami Banki reveals his true Form, possessing the powers of all three Pollution Ministers, using it in his "Mirror Bomb" attack. He was killed by EngineOh G6. he was primarily giant.

EPISODE TWNETY-FOUR Bakki Height: 222 cm to 55.5 m Weight: 201 kg to 502.5 t Hiramechimedes' ghost, refering to himself as Urameshimedes went from world to world and came upon the Samuari World, where he met Bakki. Bakki is a youma who specializes in destroying forests. He is stronger than BankiJyu and carries a sword capable of fire power. He was the only physical offense Urameshimedes had to fight against the Go-onger. Bakki mostly chased Saki and a boy spirit of the forest. Saki was able to defeat him with the boy's help. Urameshimedes posesses Bakki's body and enlarges it to kill the Go-ongers. However, the Go-on teams manage to use a G9 Grand Prix laced with salt on the two so the attack would not only kill Bakki, but exorcise Hiramechimedes in the process.

EPISODE TWENTY-FIVE Gaisuikishi Uzumaquixote Height: 213 cm to 53.2 m Weight: 240 kg to 600 t He is armed with a jousting lance and shield with the ability to consume anything from garbage to energy. Stuck on Earth as a stone statue, Uzumaquixote was found by a young Renn, thinking that it was a Jizo statue as he prayed to it to make his mother better before she died. By present day, Renn sought out the statue when he visited his childhood home, with the Minsters and Go-on Wings fighting over it. Kegalesia revives Uzumaquixote and has him attack the Go-ongers, until Renn transforms into Go-on Blue having lost all faith in the statue. After ingesting Bikkurium, Uzamaquixote is made giant. Renn perfects the Kyu-yu Soul's re-energizing powers and destroyed him with a three-pronged attack from Seiku-Oh, GunBir-Oh, and Engine-Oh. Before doing so, Uzumaquixote revealed that his master is in the Human World too.

MOVIE Raiken Height: 222 cm to 55.5 m Weight: 202 kg to 505 t The blue lion-like Yoma servant of Maki created from Shishi-no-Shin's Engine Cast, able to assume a vehicle form and uses a kusarigama weapon. He was destroyed by Go-on Blue, Black, and Silver.

MOVIE Gokumaru Height: 224 cm to 56 m Weight: 163 kg to 407.5 t The golden bear-like Yoma servant of Maki created from Tsuki-no-Wa's Engine Cast, able to assume a vehicle form. He can wield four claws and a large shuriken. He was destroyed by Go-on Yellow, Green, and Gold.

MOVIE Maki The movie's villain, she rules Samurai World from Maken Castle with a heartless outlook on life as she commands the Yoma, demonic beasts that terrorize Samurai World with Raiken and Gokumaru as her strongest servants. She also has the ability to transform into a giant hydra-like centipede with Retsu-Taka's Engine Cast and a giant fighting Yoma. In the end, she was destoryed by Engine Dai-Shogun.

EPISODE THIRTY-ONE Rombiako Height: 5 cm to 200 m Weight: 600 kg to 2100 t A monster from Sound World, Rombiako arrives to feed on noises, increasing its size. He takes a nap before it feeds again and the cycle repeats until it's too big for the world to hold. His meter would go up in blue when there was noise to make him big and the goal of both the Go-onger and Gaiark was to lower down in the red. The only means to shrink it is with beautiful feminine sound, which Rombiako hates and goes on a rampage at hearing upon hearing, evidence by a bell system that sounded like a woman's voice. In the end, the monster is stopped by the specially assembled G3 Princess group (Renn, Miu, and Kegaleshia) who shrink him and kill him with their attack.

EPISODE THIRTY-NINE to FORTY Rairaiken Height: 222 cm to 55.5 m Weight: 202 kg to 505 t The crimson-colored lion-like Yoma servant of Maki who is more strongest than Raiken but since he is not created from an Engine Cast, he is not able to assume a vehicle form. He wielded a kusarigama. He enlarged in a process called Fukoku Kyohei with Bikkurium. After Maki's death, he later arrives in Human World to take the small Engine Sword and use Engine Dai-Shogun for evil. However, the Go-ongers ruined their plan and he and Gokumaru are destroyed by Engine Dai-Shogun. He looks a lot like Raiken from the movie.

EPISODE THIRTY-NINE to FORTY Gokugokumaru Height: 224 cm to 56 m Weight: 163 kg to 407.5 t The crimson-colored bear-like Yoma servant of Maki who is more strongest than Gokumaru but since he is not created from an Engine Cast, he is not able to assume a vehicle form. He can wield four claws and a large shuriken. He enlarged in a process called Fukoku Kyohei with Bikkurium. After Maki's death, he later arrives in Human World to take the small Engine Sword and use Engine Dai-Shogun for evil. However, the Go-ongers ruined their plan and he and Rairaiken are destroyed by Engine Dai-Shogun. He looks a lot like Gokumaru from the movie.

EPISODE FORTY-EIGHT Kettei Banki Height: 220 cm to 55 m Weight: 321 kg to 802.5 t A Barbaric Machine Beast sent by Kegalesia and Kitaneidas who was modeled after all of the Barbaric Machine Beasts that came before him, therefore able to use all their attacks. In Japanese, Kettei means 'definitive.' He is scrapped by the combined finishing attacks of Engine-Oh, Kyoretsu-Oh, and Seiku-Oh.