Baki has struggled through many life and death experiences, and the 18 year-old is the current underground arena champion. In order for him to overcome his father who is the ‘strongest creature in the world’, he continues to participate daily in fierce fighting.

Baki's father, who is nicknamed the "strongest creature in the world" and is feared throughout the world for his overwhelming fighting power. He travels the ocean to participate in the Dairai Taisai, a once-in-a-century martial arts tournament where the sea kings gather.

He reigns above the law with his super-standard strength and intelligence. He is called Mr. Unchained because he lives and behaves most freely on this earth. He appears in Dairai Taisai with Dorian, one of the Sea Kings.

Imprisoned by the Black Pentagon along with Oliva, he has been dubbed “Mister 2.” Jun began martial arts training as a toddler and even founded his own sovereign nation at a young age. Officially the strongest brawler in America, he wants nothing more than to face Oliva in combat.

Maria provides Oliva, the freest and most egotistical man in America, with the only respite he can ever find. His undying love drives him to her every single day. In her younger days, Maria’s beauty turned the heads of everyone in town.

An American Army General. He and Yujiro Hanma are old friends. Gerry monitors Baki and Yujiro’s clash with the same intensity as two countries at war.

Tormented by his classmates, Rumina is forced to attack Baki’s high school. He is taking boxing lessons.

She is the daughter of the landlord of Baki's lodging house, and she and Baki are lovers. She is more worried about Baki, who has been beaten down more than anyone else.