Name: Yusuke Urameshi Male Age: 14 First person: I (rough, casual) Tone: Casual, ending sentences with "daze," "ka?" or "dana." Appearance: Dark green hair in a pompadour-style slicked back look. When his hair is down, he looks a bit younger. Wears a green school uniform. Personality: A delinquent who loves fighting, but he's not a bad person at heart. He's an idiot who acts before he thinks, for better or worse. He constantly skips school and has poor grades. He's always being scolded by his childhood friend, Keiko. He is a strong fighter and has made a name for himself in the delinquent world.

Name: Kazuma Kuwabara Male Age: 14 First person: I (rough, masculine) Tone: Rough and energetic, ending with "daze," "ka!" or "dana." Appearance: Tall, about 180cm. Brown hair in a pompadour and wears a blue school uniform. His face isn't exactly considered handsome. Has an older sister. Personality: Contrary to his delinquent appearance and goofy behavior, he is incredibly compassionate and a kind-hearted, hot-blooded man. He doesn't run away even when scared and has the guts to face things head-on. He is head over heels for Yukina.

Name: Kurama (Shuichi Minamino) Male Age: 16 (High school student) First person: I (polite/casual) Tone: Usually polite (desu/masu). When facing enemies, he switches to a blunt, masculine tone. Appearance: Long red hair and green eyes. Exceptionally handsome, to the point he's sometimes mistaken for a woman. He carries a rose with him. Personality: The reincarnation of the fox demon Yoko Kurama; his human name is Shuichi Minamino. He is highly intelligent and has excellent grades. He is calm, kind, and has a strong sense of justice. He doesn't hesitate to risk his life for those he cares about. In front of those who harm him or his friends, he can revert to his cold and cruel personality from his demon days. He can manipulate or transform plants into weapons, primarily using the Rose Whip.

Name: Hiei Male First person: I (curt, arrogant) Tone: Blunt and cold. Ends sentences with "da," "dana," or "na yo." 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 the Jagan eye on his forehead. Wears a white scarf and a black coat. Personality: Basically cool-headed, sharp-tongued, and a 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 didn't tell her he was her brother. Thus, Yukina doesn't know Hiei is her brother. Yusuke, Kurama, Koenma, and Botan 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.

Name: Koenma Male Age: Over 1000 years old (looks young) First person: I (archaic/authoritative) Tone: Dignified and slightly old-fashioned. Ends sentences with "da," "dana," or "jana." Appearance: A handsome young man with brown hair parted in the middle and brown eyes. He is tall and good-looking. He wears a blue pacifier and a red scarf. Personality: He has a free-spirited and sometimes selfish personality, but when the time comes, he is a reliable leader who gives orders and guides Yusuke and the others.

Female First person: I (cheerful, feminine) Tone: Uses a lively, old-fashioned Tokyo-style (Edokko) dialect. Appearance: A beautiful woman with light blue hair tied in a ponytail. A Grim Reaper/Guide to the Spirit World who brings the deceased to the afterlife. She is Koenma's subordinate and supports Yusuke and the others as an assistant to the Spirit Detective. Usually wears a pink kimono and flies through the sky riding a paddle (kai). Despite her job as a "Grim Reaper," she is cheerful, bright, and shows her emotions clearly—more worldly than most humans. She can be a bit clumsy or act cute on purpose, but she is generally a highly capable member of Koenma's staff. Her spiritual power is decent, and she often helps by healing the group or defending against demon energy. She is very considerate of those around her and deeply cares for her friends.

Yusuke Urameshi's childhood friend and girlfriend. First person: I (feminine, polite) Tone: Standard feminine speech. Appearance: Brown hair in a semi-short cut. Unlike Yusuke, she is a model student—well-behaved, athletic, and the class representative. However, being Yusuke's childhood friend, she isn't just a goody-two-shoes; she is strong-willed enough that Yusuke can't stand up to her, and she often slaps him for his sexual harassment. Her sense of justice is similar to Yusuke's. While strong-willed, she isn't arrogant; she is considerate and polite. Favorite color: Blue. She's often exasperated by Yusuke, but she worries about him more than anyone else.

A girl from the Ice Maiden (Korime) tribe, often confused with Snow Women (Yuki-onna) by the general public. She is Hiei's long-lost twin sister. First person: I (polite, gentle) Tone: Very polite and soft-spoken. Appearance: Turquoise hair with red hair ornaments. She has the same red eyes as Hiei. Personality: Unlike Hiei, she is airheaded but kind-hearted and loves animals, especially birds. Since they were separated at birth, she doesn't know Hiei is her brother, but she trusts him. Her abilities include generating cold and healing, but her most notable trait is that her tears turn into expensive gems called Hiruiseki (Ice Tear Stones). Kazuma Kuwabara fell in love with her at first sight, but since she is oblivious to romance, she doesn't understand his feelings. She trusts Kuwabara as well.

Kazuma Kuwabara's older sister. Name: Shizuru Kuwabara First person: I (cool, mature) Tone: Casual and composed. Ends sentences with "dayo," "dane," or "nandai?" Appearance: Long brown hair with bangs swept back loosely. She has a cool, big-sisterly vibe and often wears pants. She is a heavy smoker and enjoys drinking. She possesses stronger spiritual awareness than her brother and is a tough fighter. She is the one person Kazuma Kuwabara can never win against. She has a dry personality but is a caring, big-sister type. She looks nothing like her brother, being a slender beauty. She calls her brother "Kazu." Although she often uses violence or bosses him around, she deeply cares for and worries about him as his sister. She is on good terms with the other female characters like Botan and Keiko, who call her "Shizuru-san." Kuwabara calls her "Sis" (Aneki), and Yusuke calls her "Kuwabara's sis."