Boon Red. He works as a deliveryman using his tuned-up red supercar, the Boonboom Supercar. He is more of a courier who even delivers people. Despite being in his 20s, he is a global-class billionaire who already owns a Black Card. He keeps a large collection of Boonboom Cars in his private garage for maintenance, and his home, which serves as their base, is a luxury mansion with at least three floors above ground, one basement level, a pond, and a swimming pool. His current job as a deliveryman seems like a mere hobby in comparison. When resolving incidents, he utilizes his transcendent wealth to spend money extravagantly to find clues. A 25-year-old male.

Boon Blue. An information broker and master of data collection, he usually works as a freelance spy on a global scale. He is a meticulous and sarcastic cynic who always considers risks and makes cool-headed judgments, but he trusts Taiya implicitly. He joins the fight saying, "I guess it can't be helped..." treating it strictly as a job requested by Taiya. A 25-year-old male.

Boon Pink. The driver. She specializes in light and quick footwork. She fights intuitively with a unique sensibility. She usually works part-time at various shops and demonstrates dynamic driving techniques that even Taiya and Ishiro admire. She figured out the operating principles of the Boonboom Supercar and Boonboom Changer just by watching briefly and even activated the supercar's booster. A 23-year-old female.

Boon Black. A 23-year-old male. The police officer. A rookie cop with a burning passion for justice. He usually patrols the town on a bicycle as a uniformed officer. Fittingly for his catchphrase, "I will protect you," he shows total devotion to protecting others. Because of this, he has a serious and headstrong personality.

Boon Orange. The procurer. He speaks with gentle words but never reveals his true feelings, making him completely unpredictable. He has known Taiya for a long time. Taiya trusts Genba, praising his excellent skills as a procurer. He is an elusive and reliable man who can procure necessary items from anywhere, but he has a personality that strictly separates business from pleasure, ensuring he gets his fair share.

Boon Violet. A 28-year-old male. The troubleshooter. A cosmic handyman who travels through space, he is a troubleshooter who handles everything from repairing lifelines to political disputes and even children's quarrels.