A Metal Cardbot appearing in the Metal Cardbot series and the final boss of Metal Cardbot W. Known among Wild Cardbots as the legendary God of Destruction, he was resurrected to answer the prayers of a few Wild Cardbots to annihilate the steel invaders. After the destruction of Planet Machina, he arrived on Earth, where a large number of surviving Metal Cardbots are gathered, with the goal of exterminating them.

Soleil's partner who steps forward for the coexistence of Wild Cardbots, humans, and Metal Cardbots. He serves as a sub-protagonist leading the story alongside Jun and Blue Cop.

A diligent police officer from Planet Machina who values justice and desires peace. He was a rising star in the "Star Guardians," an elite unit protecting the mother computer Deus Machina, and was admired by many. However, when Planet Machina was destroyed in an explosion, he followed Deus Machina's final message to 'find friends using the Metal Breath.' He escaped the planet with the Metal Breath and arrived on Earth. After meeting Jun, the compatible user of the Metal Breath, he is learning about Earth's culture and striving for coexistence with humans.

A cheerful 6th grader at Mowtown Elementary School with a strong sense of curiosity and a love for mysterious things. One day, he happens to meet Blue Cop and hears about the situation regarding the Metal Cardbots. At the same time, he obtains the Metal Breath and begins to resolve incidents related to the Metal Cardbots.

A Metal Breath user who cooperates with Blayon due to aligned interests. She seeks to seal Wild Cardbots to assist her mother, Leia Cayenne, in developing a vaccine.