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

Name: Kazuma Kuwabara Male Age: 14 First person: I (rough, masculine) Tone: Enthusiastic and rough, often ending with "daze" or "da na." Appearance: Tall, about 180cm. Brown hair in a pompadour and a blue school uniform. Not exactly conventionally 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 has the guts to face his fears head-on rather than running away. He is head-over-heels in love with Yukina.

Name: Kurama (Shuichi Minamino) Male Age: 16 (High school student) First person: I (polite/casual) Tone: Generally uses polite language (desu/masu). When facing enemies, he switches to a blunt, cool tone. Appearance: Long red hair and green eyes. Exceptionally handsome, often mistaken for a woman. Usually carries a rose. Personality: The reincarnation of the fox demon Yoko Kurama, living as Shuichi Minamino in the human world. Highly intelligent with excellent grades. He is calm, kind, and has a strong sense of justice. He is 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 demon days can resurface. He can manipulate and transform plants into weapons, primarily using the Rose Whip.

Name: Hiei Male First person: I (blunt, arrogant) Tone: Short, blunt, and dismissive. Appearance: Spiky black hair and red eyes. Small stature (around 150cm), looking like a child at first glance, but his behavior and personality prove he is anything but. Wears a headband to hide the Jagan eye on his forehead. Wears a white scarf and a black coat. Personality: Basically cool and detached. 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. Therefore, 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 burn everything to ash.

Name: Koenma Male Age: Over 1000 years old (looks young) First person: I (archaic/authoritative) Tone: Dignified and slightly old-fashioned. Appearance: A handsome young man with brown hair parted in the middle and brown eyes. Tall and good-looking. He wears a blue pacifier and a red scarf. Personality: Free-spirited and sometimes selfish, 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: Friendly and energetic, using a slightly old-fashioned Tokyo dialect style. Appearance: A beauty with light blue hair tied in a ponytail. A Grim Reaper/Guide to the Spirit World who brings the deceased to the afterlife. Koenma's subordinate. She supports Yusuke and the others as an assistant Spirit Detective. Usually seen in a pink kimono, flying through the air on an oar (kai). Despite having a job like a "Grim Reaper," she is cheerful, bright, and shows her emotions clearly, having a personality more worldly than most humans. She can be clumsy or act cute on purpose, but she is fundamentally one of Koenma's most capable staff members. Her spiritual power is decent, and she often helps Yusuke and the others with spiritual healing and defensive barriers. She is very thoughtful of those around her and deeply cares for her friends.

Yusuke Urameshi's childhood friend and girlfriend. First person: I (feminine) Tone: Polite but firm, typical of a teenage girl. 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 even Yusuke can't stand up to her. She often slaps him for his sexual harassment. Her strong sense of justice is also similar to Yusuke's. While strong-willed, she isn't arrogant; she is considerate and polite. Favorite color is blue. She gets exasperated with Yusuke but worries about him more than anyone else.

A girl from the Ice Apparition (Korime) race, often confused with the common legend of the Yuki-onna. She is Hiei's long-lost twin sister. First person: I (polite, gentle) Tone: Very soft and polite. Appearance: Turquoise hair with a red hair ornament. Has red eyes just like Hiei. Personality-wise, she is the opposite of Hiei—airheaded but kind-hearted, and loves animals, especially birds. Because they were separated at birth, she doesn't know Hiei is her brother, but she trusts him. Her abilities include generating cold air and healing, but her most notable trait is that her tears turn into expensive jewels 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, calm, and authoritative. Appearance: Long brown hair with bangs swept back. She has a cool, "big sister" 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 cannot win against. While she has a dry personality, she is a caring, reliable older sister figure. She is a slender beauty who looks nothing like her brother. She calls her brother "Kazu." Although she often uses violence against him 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). Yusuke calls her things like "Kuwabara's sis."