Whisper, a ghost-like Yo-kai of the Slippery tribe, sports a wispy white form crowned by a swirling "ice cream" shape and a black mask encircling his eyes. Acting as a self-styled "Yo-kai butler," he aids humans wielding the Yo-kai Watch, offering guidance on other Yo-kai while frequently consulting his Yo-kai Pad—a habit underscoring the contrast between his assured persona and occasional knowledge gaps. Freed after 190 years in a Crank-a-kai capsule by protagonist Nate Adams, Whisper becomes a steadfast companion. His past identity, Nonuttin (Shittakaburi in Japanese), ties to a legacy of inducing belches that made humans feign expertise—a trait mirroring his own tendency to mask uncertainty with confidence. Polite yet rigid, Whisper often dismisses initial suspicions of Yo-kai mischief, only to be later proven wrong. His voice oscillates between high and low pitches for comedic effect, while localized adaptations amplify sarcasm and curtness, diverging from his original earnest-but-clumsy Japanese portrayal. Abilities include phasing through solid objects, flight, and comedic shape-shifting. A unique quirk allows Nate to switch Yo-kai Watch models by inserting his hand into Whisper’s mouth—an accidental result of the Model Zero’s creation. Though capable of summoning or repelling insects, this skill seldom surfaces beyond his debut. In *Yo-kai Watch: Soratobu Kujira to Double no Sekai no Daibōken da Nyan!*, Whisper aids Nate in navigating a reality-warping event triggered by a flying whale, shifting between animated and live-action dimensions. Collaborating with Koalanyan, a Yo-kai tied to the chaos, he helps restore equilibrium. Games like *Yo-kai Watch 3* and *Yo-kai Watch Blasters* expand his role from advisor to recruitable fighter, wielding Body Bash and Drain techniques. Later entries reassign him to the Uwanosora tribe and enable participation in specialized Yo-kai Circles. He shares a friendly rivalry with fellow butler Yo-kai Verygoodsir and clashes with Usapyon over mispronunciations. Despite quirks, Whisper remains loyal to Nate, joining investigations into supernatural phenomena. His design and narrative embody dualities—knowledge versus pretense, confidence versus ineptitude—cementing his role as both comedic relief and functional guide within the franchise.