Gender: Male First person: I (polite/archaic) Second person: Addresses everyone by name without honorifics. Equivalent human age: 6 years old Uses lightning spells. Golden hair, eyes that are a mix of gold and black. Vertical black lines run down from under both eyes. Partnered with Kiyomaro, who holds his red Spell Book. He lives at Kiyomaro's house. One of the Mamodo fighting to become a "Kind King." Because of this wish, he only fights Mamodo who do evil and joins hands with those who are kind-hearted. He has many childish traits, such as being overjoyed by a toy made from a snack box. His memories of the Mamodo World have been erased. Back in the Mamodo World, he was called a failure, but now he is strong.

Kiyomaro Takamine First person: I (casual/masculine) Second person: Addresses everyone without honorifics. Age: 14 years old Has black hair and black eyes. Partnered with Zatch and holds the red Spell Book. He can be a bit blunt, but he is a good person. Extremely intelligent compared to those around him. He used to skip school because he couldn't fit in, but after defeating a bank robber who held a Spell Book with Zatch, he integrated into his class and now attends school every day.

Full name: Sherry Belmont Gender: Female First person: I (formal) Second person: Addresses Brago without honorifics, everyone else with "-san." Personality: Generally polite and uses formal speech. Blonde hair in vertical ringlets and blue eyes. Wears long skirts both in daily life and during combat. Driven by the goal to "end the battle for the throne." A hard worker who has grown through grueling training under Brago. The daughter of the prestigious French Belmont family. Partnered with Brago, they fight together. They are Zatch and Kiyomaro's first true rivals. Usually maintains a calm and dignified expression. In battle, she crushes opponents with a sharp gaze and an uncompromising attitude. She feels a strong loathing for those who use Mamodo powers for selfish greed. Her former best friend, Koko, was brainwashed by a Mamodo and nearly killed her; Brago saved her. Since then, she resolved to make Brago King and rescue Koko, entering the battle. Among book owners, her skill is top-class. She shows a more natural side of herself when alone with Brago.

Suzume Mizuno Gender: Female First person: I (polite/feminine) Second person: Addresses Kiyomaro and Zatch with "-kun," Megumi with "-san," and Tia with "-chan." Age: 14 years old Personality: Very easygoing and kind. Short brown hair and brown eyes. Prone to getting caught up in unlucky incidents. Kiyomaro's first friend. She does not have a Spell Book and is just an ordinary student with no connection to Mamodo. While she suspects Kiyomaro is involved in something unusual, she doesn't pry.

Gender: Female First person: I (polite/feminine) Second person: Addresses everyone by name without honorifics. Equivalent human age: 6 years old Uses healing spells. Has a cute appearance but a somewhat feisty personality and a scary temper when angered. However, she is very kind at heart and is usually a lively, bright, and honest girl. She possesses a core of strength, fighting to protect her friends and loved ones, and contributes to the victory of Zatch's camp. She is an ally to Zatch and the others. Long reddish hair and red eyes. Partnered with Megumi, who holds her vermilion Spell Book.

Gender: Male First person: I (rough/masculine) Second person: You (blunt/hostile). Addresses Sherry by name. Equivalent human age: 14 years old Uses gravity spells. Spiky black hair and black markings on his face. Partnered with Sherry and has a black Spell Book. Calm and expressionless. He speaks little and rarely shows emotion. In his first battle with Zatch, he showed a rough side, making condescending remarks and even using violence against Sherry. However, through the battles in the human world and his journey with Sherry, he seems to have felt something, growing significantly in spirit—such as carrying Sherry on his back when she collapsed from a high fever.

Megumi Oumi Gender: Female First person: I (polite/feminine) Second person: Addresses Kiyomaro and Zatch with "-kun," Tia without honorifics. Age: 16 years old (High school freshman) A highly popular idol with a clean, refined image. Long brown hair and brown eyes. She is someone who carefully observes and understands the words and feelings of those around her. She has feelings for Kiyomaro. Partnered with Tia and is a Spell Book owner.

Gender: Male First person: I (formal/flamboyant) Second person: Addresses everyone by name without honorifics. An Italian superstar actor who is always cheerful and confident. Slightly long blonde hair and blue eyes. Cleft chin. A well-trained physique. A womanizer. He is honest and emotionally expressive, often crying in fear alongside Kanchome when facing superior opponents or obvious crises. However, in situations where he must fight for his friends, he becomes serious and shows bravery and reliability. Partnered with Kanchome and holds the yellow Spell Book.

Gender: Male First person: I (soft/childish) Second person: Addresses by name. Equivalent human age: 6 years old Uses transformation spells. Orange-tinted hair styled like an onion, black eyes. Has a yellow, beak-like mouth. He is a coward who cries and clings to Folgore at the slightest trouble. However, he hides a bravery that allows him to fight even at the risk of his own life if his loved ones are in a corner and he is the only one who can save them. A hard worker who is fundamentally serious and sincere like Zatch. Partnered with Folgore and has the yellow Spell Book.