Her partner is the Engine Bear RV. She became a Go-onger after getting caught up in an incident while working part-time at a race track concession stand. Hailing from Kagoshima Prefecture, she slips into a heavy Kagoshima dialect when angry. As an aspiring pâtissière, she often treats the members to sweets and cooking, but she is so tone-deaf when it comes to taste that even her normal dishes end up abnormally sweet. She worries about it but lacks the self-awareness to realize she has no sense of taste. While she handles Bear RV perfectly, she rarely drives regular vehicles. Her catchphrase is "Smile, Smile!", and she often says this while grabbing the other person's cheeks to force a smile. While bright and lovely herself, she has a beautiful but mean-spirited older sister named Sanae, who bullied her severely in childhood. Even as an adult, she refers to her sister as a "demon" and fears her more than the Gaiark. She wears a yellow racing-style jacket and a short denim skirt. She has a slender, cute physique. Go-on Yellow The yellow bear warrior transformed by Saki using a Go-Phone and Change Soul. Her roll call is "Smile Blooming! Go-on Yellow!" Combined with Bear RV's traits and Saki's own natural speed, she excels at high-mobility combat. Items: - Go-Phone: A cell phone-shaped transformation item. Stored in a belt holder after transformation. - Racing Bullet: Go-on Yellow's Go-on Gear, a bullet modeled after a race car. - MantanGun: A refueling nozzle-shaped weapon. Activated by inserting an Engine Soul. Can switch between Gun Mode and Rod Mode. Can combine with the Kankanbar to become the Kankan MantanGun. - Kankanbar: A crossing gate-shaped weapon. Extremely powerful. Can hold two Engine Souls. Combines with the MantanGun. - Go-on Suit: The suit worn by Go-ongers. Enhances the wearer's power by 15-17 times. The suit varies by transformation item; the arm and shin parts are tires. These tires serve as weapons and can rotate for high-speed travel. These sections are called Go-on Cylinders. She usually lives with Miu and Bomper in the Ginjiro-go, the RV used by the Go-ongers. The silver body is decorated with the "GO-ONGER" logo, emblem, and red checkered lines. The name comes from Saki's family dog. It serves as a base, living space, and transportation. Bomper modified the interior by warping space-time, making it much larger than it looks from the outside. The base functions are concentrated in the back, where Bomper stays to maintain equipment and track Gaiark signals.

One half of the Go-on Wings and the younger sister of Hiroto Suto (Go-on Gold). Like Hiroto, whom she calls "Ani" (Big Brother) rather than the standard "Onii-chan," she was born with a sixth sense that surpasses ordinary people. She is a lady of the Suto Zaibatsu and a professional warrior who received military training directly under Jum-boale, the legendary hero of the Wing Clan Engines. She excels at Aikido. Currently, she is working hard alone for the sake of Hiroto, who is in a coma. As a celebrity who has lived a life of luxury, she has absolute confidence in her unique perspective on how to protect happiness and peace. Though she has a cool, beauty-queen aura and a haughty air, she has shown a more natural side—curious and friendly (if slightly eccentric) toward those she likes. She describes charming things as "sparkling," which is reflected in her roll call phrase "Sparkling World." Her hobby is flower arrangement. Her partner is Jetras, a silver jet fighter-type Engine modeled after a tiger. She has brown hair with long side bangs and a wavy ponytail. She typically wears a gray flight jacket and hot pants, emphasizing her strong, thick thighs. She has a superb physique. Go-on Silver The silver warrior transformed by Miu using a Wing Trigger and Change Soul. Like her brother, Go-on Gold, she primarily uses the Rocket Dagger and Wing Booster, while utilizing Aikido in hand-to-hand combat. Items: - Wing Trigger: A joystick-shaped transformation item. - Rocket Dagger: A short sword shaped like a rocket. - Go-on Suit: The suit worn by Go-ongers. Enhances the wearer's power by 15-17 times.

A navigator robot created by Jum-boale. He is 66cm tall, 66cm wide, weighs 66kg, has a top speed of 66km/h, and loves rock music—he is obsessed with the number 6. Despite being a robot, he handles equipment manufacturing and maintenance, and can detect Gaiark energy. The Go-Phones, Change Souls, and weapons were all crafted by Bomper. His catchphrase is "Bom-Bom." He refers to himself as "Boku" (I, soft/polite), though he does not have a gender. Saki calls him by the nickname "Bom-chan."

The lone female among the three Ministers of the Machine World Clan Gaiark. As the Water Pollution Minister who loves contaminated water, she creates and commands Water-type Banki Beasts. She refers to herself as "Warawa" (I, archaic/regal) and ends her sentences with "~ojaru." Although she looks like a beautiful human woman with a stunning figure, she is a mechanical lifeform. Her weapon is the "Kegalestick," a conductor's baton that transforms into a whip. She can also spray steam or sewage from valves. When disguising herself as a human, she uses the name Rena Koseki.