Kazuma is a former member of the Kannagi household. He was banished from the family by his father after he was defeated by Ayano during the Successor Ceremony for the Enraiha, his family's sacred sword. Since Kazuma is a son from the main family, making him the legitimate successor, even his own father considered him a disgrace for lacking the power to use fire magic, his family's specialty. Four years later, at the age of twenty-two, he returns to Japan as a skilled master of the wind arts. Though he was not responsible for the killings in the Kannagi household, he is prepared to start a war with his former family.

Revy does most of the fighting for the Lagoon Company. Very little is revealed about her past, although portions can be pieced together through the series. Revy is a Chinese-American born and raised in Chinatown, Manhattan, near Mott Street, spending most of her youth as a thief and murderer. Flashbacks throughout the series reveal that Revy may have honed her skills with firearms by shooting at cans, and that her first murder may have involved shooting an unknown man while using a pillow. It is unknown whether the pillow was used to suppress the noise or to help avoid looking at her first victim. Revy is very competitive, easily bored, and extremely ill-tempered. Unlike Rock, she is undiplomatic, believing in the use of brute force and coercion to get her way. In contrast to this, she's revealed to be highly ticklish.

Sephiroth appears as the main villain in Final Fantasy VII, killing the president of the company Shinra is one of his first actions. Sephiroth was once the best and the most powerful member of SOLDIER, the elite warriors division of Shinra and rose to the status of celebrity during the war. After the war, however, Sephiroth was sent on a mission to the village of Nibelheim, wherein he discovered that he is the product of a biological experiment using cells from the extraterrestrial lifeform Jenova cells. Learning that Jenova tried to take control of the planet years ago, Sephiroth decides to follow her wish. Sephiroth then burns down the entire village and kills many, but is assumed dead after a confrontation with the game protagonist Cloud Strife. A few years later, Sephiroth once again appears to continue his mission.

Souichi Negishi is a shy young calm and peaceful musician, but some reason he became the singer, songwriter and leader of the extreme metal band "Detroit Metal City," with a stage name "Johannes Krauser II." Whenever he wears the heavy makeup, Negishi turns into his alter-ego with exact opposite personality, shouting the most vulgar profanities beyond anyone's imagination about hate, violence, killing and rape. A true demon from the hell.

Hiei is a male fire demon born to a race of female ice demons. His mother, Hina, is forced to abandon him because koorime prohibit male children. Hiei is taken in by a group of thieves, and he learns to kill at a very young age. Throughout his childhood, his one shred of sanity is a necklace made from his mother's hiruiseki (氷涙石, ice tear stone). He eventually loses the necklace in the heat of battle. In order to find the lost hirui, Hiei acquires the Jagan. He uses the Jagan to seek out the place of his birth and learns that his grief-stricken mother committed suicide; Hiei also learns that he has a twin sister, Yukina, who has disappeared from the village. He now has another goal, to search for Yukina. Hiei is aloof, elusive, and misanthropic, often belittling and mocking humans and their emotions.