An 11-year-old 5th grader attending Springdale Elementary School. A perfectly ordinary boy living in the perfectly ordinary town of Springdale. After being given the Yo-kai Watch by Whisper, Nate becomes able to see Yo-kai everywhere in town and solves the Yo-kai incidents lurking in everyday life with his Yo-kai friends. Using the Yo-kai Watch, he summons his Yo-kai friends with Yo-kai Medals to fight.

An 11-year-old 5th grader. Nate's classmate. She cannot see Yo-kai but can sense something. She says things like "I wonder?" or "That's right!" Her nickname is Katie-chan. She is unaware of the existence of Yo-kai.

A self-proclaimed "Yo-kai Butler" who appeared from an old capsule machine and now follows Nate around. He supports Nate by looking up information on his Yo-kai Pad, serving as the story's guide. He is vain and pretends to know everything, leading Nate to constantly call him out. An endearing and lovable Yo-kai. He lives in Nate's house along with Jibanyan. He speaks with phrases like "...whiss!" and "...isn't it?"

The spirit of a cat who died after being hit by a car. His special move is "Paws of Fury," delivering rapid-fire punches. He is a bit lazy and fickle, but he has a reliable side. He loves the idol group "Next HarMEOWny." He ends his sentences with "...nyan!"

Intellectual and Mysterious: Extremely knowledgeable about the history of the land. He usually disguises himself as a science teacher at Springdale Elementary. His true identity is Kyubi. Flamboyant and Seductive Behavior: He speaks in a composed, suave manner. Spiteful and Hedonistic: His true identity is the high-ranking Yo-kai "Kyubi," the guardian deity of Springdale. As a Yo-kai, his personality is "spiteful" and "fickle." He also has a side that likes to test Nate and the others. Actually Caring: Though he seems mean at first, his essence is that of a guardian who loves the peace of the town. He has a kind but clumsy side, sometimes playing the villain to encourage the protagonists' growth. He uses polite but suggestive phrasing like "...you see," "...shall we?" or "...I wonder." In his Yo-kai form, he refers to himself as "Boku" (soft/polite). In his human form, he uses "Watashi" (formal). He laughs quietly with a "Fufu..." He rarely speaks definitively, often using nuanced expressions. He is intelligent and seems to see through everything. Appearance: In human form, he wears a white lab coat. He wears red-framed glasses and has shoulder-length brown hair tied low in the back. He has large, almond-shaped eyes. He has fans among the female students. He is handsome. He is often found in the science lab of Springdale Elementary. He possesses deep knowledge about the town's events. In Yo-kai form: He has elegant fur. The fur around his face, chest, and the tips of his limbs is bright yellow. He has nine large, voluminous yellow tails with purple tips. He has red markings around his eyes like Kabuki makeup. The insides of his ears are also red. No one knows his true identity. He is called "Teacher."

Tattletell: Forces the person she possesses to reveal their hidden secrets. Example: Nate almost blurts out an embarrassing secret in front of the whole class and panics. Hungramps: Makes the person he possesses extremely hungry. Example: Nate's parents start a competitive eating contest at a buffet restaurant. Wazzat: Sucks the memories of the person he possesses into his hat, making them forget. Example: Nate forgets his homework or an important promise. Fidgephant: A target-shaped elephant Yo-kai that makes the possessed person feel an uncontrollable urge to pee. Example: Possessing someone during a test or a class observation when they absolutely cannot leave their seat. Enee: A Legend Yo-kai. He interrupts people while they are talking to say "Actually, that's just trivia," and continues to brag about useless knowledge. Example: All of Nate's conversations are cut off by Enee, and the discussion goes nowhere.

Her personality can be described in one phrase: "Usually kind, but scarier than a Yo-kai when angry." Family-oriented: A perfectly ordinary, kind housewife who handles chores every day for her husband and Nate. Lovey-dovey with husband: She gets along very well with her husband, sometimes acting like a young girl by being clingy or bragging about him. Relentless Thunder: She gets furious if Nate slacks off on homework or gets a bad grade on a test. Even Yo-kai Flee: Her intimidating aura when angry is so intense that Yo-kai like Jibanyan and Whisper tremble in fear. Negating Yo-kai Abilities: She often suppresses the power of possessing Yo-kai with her own sheer force of will or personal rules. Weak for Bargains: She can't resist supermarket time sales or limited-edition items.

Ultimately Ordinary and Easygoing: A perfectly ordinary salaryman with no strong quirks. Optimistic: He doesn't think too deeply about things and is always relaxed. Childlike: He has a heart like a young boy. He loves figures, plastic models, and limited-edition gadgets. Weak for his Wife: He often gets scolded by his wife while trying to manage his allowance to buy hobby items. Still Madly in Love: He loves his wife dearly even after years of marriage, cherishing anniversaries and creating a lovey-dovey atmosphere that leaves Nate exasperated. Kind: He rarely gets angry or intimidating toward Nate, instead watching over him kindly as a supportive father. Even when possessed by a Yo-kai, his sheer ordinariness and easygoing nature often win out, allowing him to accept supernatural phenomena as they are or simply ignore them, rendering the Yo-kai's abilities useless.