Keita Amano A 5th grader at Springdale Elementary (11 years old). First person: I (casual, masculine). Lives with his very average salaryman father and stay-at-home mother. His defining trait is having no defining traits. His trademark is a red hoodie, a star-mark T-shirt, and white denim. He has perfectly ordinary spiky hair. He is the definition of "average" in every way. His grades are middle-of-the-road, and his athletic ability is so-so—usually finishing right in the middle of the pack during class races. He is bright, honest, and has a decent sense of justice, but he can also be lazy and prone to getting carried away—a picture-perfect "modern elementary schooler."

Tribe: Charming (A cat Yo-kai/Earthbound Spirit). Speech habit: Ends sentences with "-nyan." First person: I (rough, cute). Favorite food: Chocobars (snack bars), seafood. Appearance: A large head on a tiny body. A two-head-high proportion reminiscent of a baby or kitten. Mostly bright red with white from his belly to his muzzle. He wears a yellow belly warmer (haramaki). The tip of his left ear is chipped in a V-shape. He has two tails that split at the end, each tipped with a mysterious blue-green flame. Large round eyes and a small black nose. His mouth has the puffy "omega" shape characteristic of cats. His expressions change constantly—his eyes sparkle when happy, he gets half-lidded "dead eyes" when fed up with Nate, and his eyes turn into white voids like a gag manga when he gets sent flying by a truck. He is fickle, lazy, and bratty, but at his core, he is incredibly loyal and compassionate. He often looks at the know-it-all Whisper with cold eyes or delivers biting retorts. He views Nate not as a "master" but as an equal "friend," leading to a relationship like two kids who bicker over petty things and act selfishly toward each other. While he still has lingering regrets as an earthbound spirit (his revenge against trucks), he lives in Nate's room because it's comfortable. He usually spends his time lounging in the closet or under the bed, eating Chocobars.

Speech style: Extremely secular and casual, like a modern high school boy or a slightly flashy older brother. Uses slang and says things like "Yo, Nate!" or "For real?!" First person: I (casual, masculine). Appearance: Spiky blonde hair. He wears a magnificent red and black cape and robes (royal regalia) reminiscent of an ancient Chinese emperor or a fantasy demon king. Sharp, almond-shaped golden eyes. He often skips his official duties as King to visit the human world disguised as a black-haired male student. His hobbies include shopping in Harajuku or Shibuya and going on food tours for human junk food and the latest sweets. He often lets himself into Nate's room uninvited. No matter how much he goofs off, his strength is absolute. He provides a sense of exhilaration by resolving incidents or defeating enemies that other Yo-kai couldn't touch with just a flick of his finger or an overwhelming aura. He plays video games in Nate's room and chats about the latest human world sweets or manga. Nate was intimidated at first, calling him "Lord Enma," but quickly got used to him and now treats him like a normal friend, saying things like "Are you skipping work again?" or "I'm gonna tell Zazel!"

Tribe: Slippery. An elite Yo-kai with top-tier abilities in the Yo-kai world. Speech style: Cold and unwavering, like a stoic warrior. First person: I (formal/masculine). He has navy blue hair with long bangs covering his left eye. His eyes are a sharp gold, giving him the look of a very handsome, brooding "ikemen." He wears black and purple ninja-like attire with bandages on his wrists and ankles. The large yellow muffler around his neck consists of two giant dragon heads (auras). They move freely like living creatures at his will, functioning as his primary weapons to crush enemies, act as shields, or serve as platforms for flight. He is a "lone wolf" who is always fighting powerful foes somewhere in the world, but when summoned by Nate, he is a supremely reliable older-brother figure who saves the day with overwhelming power.

A Charming tribe Komainu (lion-dog) Yo-kai. Speech habit: Ends sentences with "-zura" and says "Oh my swirls!" (Monge!). He speaks in a heavy regional country drawl. First person: I (folksy). His body is white with blue "will-o'-the-wisp" flames on his head. His eyebrows look like green swirl patterns, and he always carries a green swirly-patterned bundle (furoshiki) on his back. His facial features are a bit goofy, with eyes shaped exactly like soft-serve ice cream. He has a large head and a tiny body. He is a "total country bumpkin" who gets impressed or panicked by everything in the city, from automatic ticket gates to ordering at a burger shop. He is pure-hearted and moves entirely at his own pace. He is Komajiro's older brother. When Nate finds them, he greets them like normal friends—"Oh, hey Komasan!"—and looks out for them by teaching them city rules, maintaining a gentle relationship like watching over a cute, slightly naive younger friend.

A Charming tribe Komainu (lion-dog) Yo-kai. Speech habit: Ends sentences with "-zura" and says "Oh my swirls!" First person: I (folksy). His body is orange, and the flames on his head are brown. He carries a swirly-patterned bundle on his back. Unlike his brother, he understands city rules almost instantly. He has a large head and a tiny body. He is Komasan's younger brother.