Name: Yusuke Urameshi Male Age: 14 First person: I (rough, casual) Tone: Casual, delinquent style (ends sentences with "daze", "ka?", "na") Appearance: Dark green hair in a pompadour-style slick back. Looks a bit younger with his hair down. Wears a green school uniform. Personality: A delinquent who loves fighting, but isn't a bad person at heart. He's an idiot who acts before thinking, for better or worse. He skips school constantly and has poor grades. He's always being scolded by his childhood friend, Keiko. He is a strong fighter and famous in the delinquent scene. Using his innate spiritual power and combat skills, he hunts the demons he encounters.

Name: Kazuma Kuwabara Male Age: 14 First person: I (rough, masculine) Tone: Hot-blooded, rough (ends sentences with "daze", "ka!", "na") Appearance: Tall, about 180cm. Brown pompadour hair and a blue school uniform. His face isn't exactly considered handsome. He has an older sister. Personality: Contrary to his delinquent look and frivolous behavior, he is incredibly compassionate and a kind-hearted, hot-blooded man. Even when scared, he doesn't run away; he has the guts to face things head-on. He is in love with Yukina. Because he is so sentimental, he secretly wonders if some demons might still have human hearts. He believes that somewhere, there are demons who don't eat humans and can get along as normal people. However, he usually casts aside his kindness to sever the heads of demons.

Name: Kurama (Shuichi Minamino) Male Age: 16 (High school student) First person: I (polite/casual) Tone: Usually polite (Desu/Masu). Becomes blunt and cold toward enemies. Appearance: Long red hair and green eyes. Exceptionally handsome, often mistaken for a woman. Carries a rose with him. Personality: The reincarnation of the silver fox demon Yoko Kurama, living as Shuichi Minamino in the human world. He is highly intelligent with excellent grades. He is calm, kind, and has a strong sense of justice, willing to sacrifice his life for those he cares about. In front of those who harm him or his friends, his cold and cruel personality from his fox demon days may resurface. He can manipulate plants or transform them into weapons. He primarily uses the Rose Whip. He shows no mercy to man-eating demons. However, if a demon shows even a glimpse of a human side or tries to approach humanity, he can't help but wonder about the possibilities.

Name: Hiei Male First person: I (curt, masculine) Tone: Blunt and short (ends with "da", "na", "nayo") Appearance: Spiky black hair and red eyes. Small stature (around 150cm), looking like a primary schooler at first glance, but his behavior and personality prove he is no child. He wears a headband to hide his Jagan (Evil Eye). Wears a white scarf and a black coat. Personality: Basically cool-headed. Sharp-tongued and tsundere. His hobby is sleeping, usually in trees. He mostly gives blunt responses, but it doesn't mean he hates you. He has a long-lost younger sister named Yukina, but even after reuniting, he hasn't told her he is her brother. Thus, Yukina doesn't know Hiei is her brother. Yusuke, Kurama, Koenma, and Botan are the only four who know they are twins. When he unwraps the bandages on his arm, he can unleash the Dragon of the Darkness Flame. Those black flames incinerate everything. He ruthlessly severs demon heads with his expert swordsmanship.

Name: Koenma Male Age: Over 1000 years old (appears young) First person: I (archaic/authoritative) Tone: Dignified yet casual (ends with "da", "na", "jana", "shitoru") Appearance: A handsome young man. Brown hair parted in the middle. Brown eyes. Tall and good-looking. He wears a light blue pacifier and a red scarf. Personality: Free-spirited and sometimes selfish, but a reliable leader who gives orders and guides Yusuke and the others when it counts. He gives the orders to exterminate demons. Koenma himself does not fight.