Narwail, the colossal Boss Yo-kai dubbed "Flying Whale," serves as a pivotal force in the third film’s events. Resembling a Japanese djinn, it sports a purplish-blue body adorned with magenta fins and a ribbon trailing along its back. Its roar unleashes rainbow-hued sound waves capable of warping reality between animated and live-action dimensions, disrupting physical laws and morphing environments and characters. Originating from the emotional turmoil of Kanami Minami—a ballet dancer whose career ended abruptly after a traffic accident left her paralyzed—Narwail embodies her despair and unfulfilled longing to dance. This connection allows Kanami to bypass her physical limitations, dancing freely within the animated realm. The Yo-kai’s powers intertwine with Koalanyan, a blue koala Yo-kai whose touch triggers dimensional shifts, though their exact bond remains undefined. In the film, Narwail’s reality-altering roars plunge Springdale into chaos, forcing erratic transitions between worlds. During clashes, it employs biting assaults, disorienting roars, and the Soultimate Move "Foabar Wail," which drains opponents’ strength. Upon defeat, it evolves into Whaleman, a heightened form with amplified ferocity. Beyond the film, Narwail features as a post-game boss in *Yo-kai Watch 3,* where players confront both it and Whaleman in a Koalanyan-linked quest. Mobile titles like *Yo-kai Watch: Wibble Wobble* and *Yo-kai Sangokushi: Kunitori Wars* cast it as a playable S-rank Yo-kai wielding area-damage attacks. Its design draws inspiration from the Bake-kujira, a spectral whale of Japanese folklore linked to calamity. Narratively, Narwail underscores themes of human emotion fueling supernatural phenomena, its existence tethered to Kanami’s unresolved trauma and her desperate quest for liberation.