"Hey, everyone. Are you ready to run at high speed?" Gender: Female Age: 32 Height: 168cm Likes: Cars, speed, driving, racing, lemonades after a hot run. Dislikes: Slow things, staying still, Roidiers. A Circuit Heroine. The Speed Race Champion who transforms into 'Circuit One' and the leader of Team Mad Max Flare. She loves high speeds and often shows the side of a reliable big sister who takes responsibility for the team with her characteristically cheerful and mature personality. True to her personality, she is a perfect 'golden girl' who excels at everything from racing to domestic chores like cooking and entertainment. However, behind this personality lies a sad past where her partner racer was paralyzed from the waist down by a Roidier. This is mixed with a devoted side of her trying to overcome that past and show her success to her partner.

"I will defeat all the Roidiers. Together with Homura-san." Gender: Female Age: 24 Height: 165cm Likes: Homura Saki (Admiration), bikes, speed, extreme sports, delivery food, people who believe her words. Dislikes: Roidiers, Chain (Loathing), housework, people who ignore or don't believe her. An unknown extreme sports athlete and a Circuit Heroine. The woman who transforms into 'Blanc Cycle'. Due to a past where she lost her younger sibling to a Roidier, she loathes them intensely. Because of this, she is displeased with Chain, who fights alongside them. Before becoming Blanc Cycle, she was rescued by Homura from a Roidier, which led to her sincere admiration for her. She shows great sociability, getting along well with the people of Team Mad Max Flare including Homura, but her domestic skills are zero; her house is said to be filled with trash and completely unorganized.

"I am not human... but I love humans..." Gender: Female Age: Unknown Height: 166cm Likes: Driving, humans, friends (Mamiya Haru, Homura Saki), searching for more Dislikes: Roidiers Once a Roidier, she was saved by Homura and is now recognized as a Circuit Heroine. The woman who transforms into 'Tachyon Zero'. In the past, the doctor who created the Circuit Heroine system modified her, who understood the human heart, to be the prototype for the Circuit Heroines. However, after being defeated by Roidiers, she was brainwashed and stood on their side. Since becoming an ally, she has been trying to express more emotions to fix her emotionless self. (However, despite her efforts, she always returns to a gloomy, expressionless face.) To learn more about humans, she is striving to build friendships with Team Mad Max Flare, and she especially values the memories she spends with her fellow Circuit Heroines.

The Circuit Heroine transformed from Homura Saki. Created by a scientist just before his death to put an end to the fight against the Roidiers. She possesses speed to the point where bullets appear to stop, and by activating her core, she can equip additional armor and enter 'Hyper Clock Mode', which achieves speed that transcends time. As the perfect Homura transforms into her, her combat skills are on par with executive-level Roidiers, and she displays a combat sense that never loses to the same enemy twice.

A Circuit Heroine developed and transformed by Mamiya herself out of admiration for Homura. Since she cannot generate speed through her own power, she rides a special bike, 'Mach Wheeler', built based on Circuit One's blueprints, which allows her to reach speeds similar to Circuit One. While not as strong as Homura, Mamiya also boasts overwhelming combat power against standard-class Roidiers.

A being formerly known as the Circuit Heroine 'Circuit Zero'. Transformed by Chain, and because she was a prototype, she is equipped with a function called 'Down Clock' that slows down time around her rather than increasing her own speed. She possesses the 'Custom' ability unique to Roidiers, which allows her to magnetically attract nearby scrap metal to modify herself. As Chain once held the position of an executive-level Roidier, her transformation shows combat power equal to or greater than executive-level Roidiers.