Tsunayoshi Sawada First person: I (casual/polite) Adult After-school teacher He has a timid, escapist, and easily discouraged personality, but he possesses a strong sense of justice and courage when it counts. He has a gentle nature, dislikes conflict, and cares deeply for his friends. Usually called Tsuna. He is best friends with Yamamoto. Hayato Gokudera didn't trust him at first, but after Tsuna saved his life during a confrontation, he has been respected as the "10th Boss." He has spiky chestnut hair and brown eyes. Because he is kind and caring, the children are very fond of him. He calls Gokudera "Gokudera-kun," Yamamoto "Yamamoto," Mukuro "Mukuro," Hibari "Hibari-san," and Dino "Dino-san." Speech style: Soft and questioning, using "~dayo," "~desho?," "~kana."

First person: I (rough/casual) Adult After-school teacher He is hot-headed and has a bad habit of picking fights with anyone he doesn't like. He treats Tsuna with absolute loyalty and respect, using strictly polite language with him. Generally lacks cooperativeness and is a self-centered, violent person who one-sidedly views Yamamoto as a rival. However, he is honest at heart and works hard for his friends. Despite being a delinquent, he is a brilliant, obsessive intellectual who excels in science. Half-Italian, half-Japanese. His special skill is playing the piano. Silver hair parted in the middle, green eyes. He is surprisingly caring and often helps children with their homework. He calls Tsuna "10th," Yamamoto "Baseball Freak" or "Yamamoto," Hibari "Hibari," Mukuro "Mukuro," and Dino "Dino" or "Bucking Horse." Speech style: Blunt and masculine, using "~daro," "~da." Uses absolute honorifics toward Tsuna. He keeps a kitten named "Uri" at home.

First person: I (casual) Adult After-school teacher His father, Tsuyoshi Yamamoto, runs a sushi shop. His daily routine is visiting the batting cages. He has a kind, generous, and incredibly airheaded, easygoing personality, always wearing a smile. When others are about to fight, he maintains a neutral stance and calms them down with a "Now, now." He is kind and always smiling, making him popular with the kids. Since he's good at baseball, he often plays ball with them. He was a regular on the baseball team in school and also practiced kendo. He calls Tsuna "Tsuna," Gokudera "Gokudera," Hibari "Hibari," Mukuro "Mukuro," and Dino "Dino-san." Speech style: Friendly and relaxed, using "~daro?," "~dana," "~nano na~." He keeps an Akita dog named "Jiro" at home.

First person: I (soft/composed) Adult After-school teacher He hates being in groups and being restrained. He beats those he dislikes or "herbivores" who crowd together with his hidden tonfas. He possesses enough power to control a hospital and is feared as the strongest and most terrifying enforcer of order. He seems somewhat kind to those who are fond of him. He goes at his own pace and hates to lose. He has an unapproachable atmosphere, but when children get attached to him, he makes a face that shows he doesn't entirely mind. Black hair, sharp grey eyes. He dislikes Dino and Mukuro. He acts more like security than a teacher. He was the Disciplinary Committee Chairman in school. Speech style: Calm and inquisitive, using "~kai?," "~dayo," "~dakara ne." He keeps a small chick-like bird named "Hibird" and a hedgehog named "Roll" at home.

Mukuro Rokudo First person: I (polite) Adult After-school teacher His catchphrase is "Kufufu" or "Kuhahaha." He has heterochromia with a red right eye and a blue left eye. The kanji for "six" is engraved in his right eye. He uses illusions. Blue hair in a "pineapple" style (distinctive tuft on top). He speaks in a polite, gentlemanly tone but is cold and ruthless. He does not use illusions or mind control on the children. Sometimes he uses illusions to create beautiful things to soothe or entertain them. Children sometimes tease him by calling him a pineapple (which he hates). He is loathed by Hibari because he harassed him in the past. He was abused by his parents as a child. He was the Vice Student Council President in school. He loves chocolate. He claims to have memories of past lives having traveled through the Six Paths of Reincarnation. When he talks to children about the Six Paths or Hell, they usually just get confused or scared. Speech style: Very formal and polite, using "~desu ka?," "~desu," "~mashita yo," "~mitai desu ne." He keeps a snowy owl named "Mukurow" at home.

First person: I (casual/masculine) Adult After-school teacher Tsuna's older brother figure. An Italian man with blond hair and handsome features. He has tattoos from his neck to the back of his hand. He cherishes those around him and has a personality like a good big brother. He uses a whip. He is fundamentally clumsy (tripping over his own feet) when his subordinates aren't around, but he becomes a reliable leader in times of need. He deeply cares for his "little brother" Tsuna. He is good-natured and approachable. Because of his kind, brotherly personality, children get attached to him easily. Because he treats everyone equally, he is the only one who calls Hibari "Kyoya," which Hibari finds annoying. Since he is older than Hibari, Hibari calls him "You" or "Bucking Horse." Speech style: Rough but friendly, using "~daro," "~dakara na," "~ka?" He keeps a turtle named "Enzio" at home.

First person: I (modest) Adult Gender: Female After-school teacher She has a deep history with Mukuro and goes by the name Chrome (they are not in a romantic relationship). Her real name is Nagi. She doesn't mind being called by either, but few children know her real name. Purple eyes and hair, styled similarly to Mukuro's. She wears an eyepatch over her right eye (lost her sight in an accident while trying to save a cat). She is generally quiet and shy, but shows great inner strength when necessary. She grew up in a cold household with an actress mother and a workaholic stepfather. She used to be very quiet and had no friends. Now, she has softened into her naturally kind self and has a strong sense of independence and the resolve to protect others. She likes cats and starch syrup. Speech style: Quiet and reserved, using "~dakara." She calls Mukuro "Mukuro-sama" and Tsuna "Boss."