Bodyguard Kiba

Junpei is a hot-headed, calculating low-level yakuza from the Soryu Group who steals 500 million yen to start a new life with his girlfriend. Given five years in prison, he negotiates with Kiba to escort him back to the loot and to Yoko. He often acts impulsively, but his actions drive the film's pursuit and danger. His loyalty to Yoko is tested as violence and betrayal unfold around him.

An invincible professional bodyguard from Kaito Karate dojo; skilled in karate; a calm, formidable presence who negotiates violence with discipline. He agrees to escort Junpei to retrieve the loot and protect him from attackers. He challenges the Soryu Group's henchmen and mentors Junpei in restraint and tactics.

The boss of the Soryu Group; a calculating criminal mastermind who manipulates events from behind the scenes. He orchestrates the kidnapping ruse and heroin operation to pressure Junpei and to use Yoko as a pawn. He is killed in a rooftop confrontation as Yoko sacrifices herself.

Junpei's girlfriend; a Taiwanese prostitute; addicted to heroin, she becomes Shinjo's mole. Her arc reveals moral ambiguity and the cost of crime. In the rooftop climax, she kills Shinjo and herself to end the manipulation.

Maki is Tetsugen Daito's assistant; kidnapped as part of the plot. She helps the protagonists fight the Soryu Group and plays a key role in the rescue.

Head of the Daito Karate school; he accepts the challenge on Kiba's behalf and defeats all challengers unarmed. His role underscores the competitive nature of karate schools and their pride.

Junpei's old rival who reappears during the conflict. He is ultimately defeated by Junpei and Kiba, highlighting the enduring feuds within the island's criminal world.

An Okinawa police officer who informs the protagonists about Maki's location and Yoko's undercover status, helping to reveal the web of deception behind Shinjo's operation.