Ittan Momen is a yōkai from Japanese Kagoshima Prefecture folklore, traditionally depicted as a malevolent white cloth strip about one tan (approximately 10 meters) long that attacks humans via strangulation or suffocation. Within the "GeGeGe no Kitarō" universe, he is reimagined as a benevolent member of the Kitarō Family and the 47 Yōkai Warriors. Physically, he resembles an elongated strip of white cotton with thin, pointy eyes lacking discernible pupils and no visible mouth, though he consumes food and beverages. His body is typically 10 meters long but can stretch or contract; his head contains bone, making it his hardest part. His design evolved across anime adaptations, showing variations in shading, creases, eye color (dark blue to orange sclerae), and finger details. Narratively, Ittan Momen debuted in the 1966 manga arc "The Great Yōkai War," fighting alongside Kitarō against Western yōkai. He was killed by the Witch piercing his heart with a poison needle. He later reappeared alive in "Yōkaijū" without explanation. Across subsequent anime seasons and films, he consistently serves as the primary aerial transport for Kitarō and allies, using his flight capability to carry multiple passengers with agility and speed. He is also a competent fighter, constricting enemies with his cloth-like body to restrain them and employing techniques like the "Momen Cut," "Ittan-Momen Whirlwind Slice," and "Twisting Pierce" to cut or pierce targets. He demonstrates regeneration: when torn or damaged, he can be sewn back together or sometimes regenerate naturally over time, with water aiding his recovery in the 2018 anime. His personality blends loyalty and combativeness. Described as a "war hawk," he prefers confrontational solutions but remains dedicated to protecting allies. He maintains fastidious cleanliness and exhibits human-like preferences, including an affinity for chocolate, sweet potato shochu, beautiful kimonos, and an interest in romantic relationships. Despite lacking a visible mouth, he participates in social activities like communal meals and music. His weaknesses align with his cotton composition: vulnerability to fire, scissors, and water (though water's effect varies, sometimes impairing him and other times aiding regeneration). In broader cultural depictions like Takashi Miike’s 2005 film "The Great Yokai War," Ittan Momen appears among yōkai rallying against Katō, portrayed as initially hesitant but remaining after encouragement, showing underlying bravery. His popularity extends to real-world representations, including bronze statues on Mizuki Shigeru Road in Sakaiminato and merchandise like PVC stickers.