Ippon-Datara (一本ダタラ, One-legged bellows), is a one-legged yōkai.
He appears in the fourth movie based on the third anime adaptation, GeGeGe no Kitarō: Gekitotsu!! Ijigen Yōkai no Dai-Hanran!!.
He appears in episode #51, The Snow Falls! Kasa-Jizō. Ippon-Datara chases down three kitsune children for a snack, but loses their track and rests by several Kasa-Jizō, unaware that three of them are the kitsune children. He notices several times that they may be moving little every time he sees it. Much later Kitarō arrives trying to find the children, meeting Ippon-Datara who was trying to chase them. He gives him some food, pacifying him as he goes off somewhere else.
He appears in the movie GeGeGe no Kitarō: Nippon Bakuretsu!! He is one of the chosen 47 Yōkai Warriors and represents Wakayama Prefecture. His mark is located on the front of his leg. Due to the fifth anime adaptation's sudden cancellation at 100 episodes, he is among the 23 Yōkai Warriors that were not revealed aside from the movie.
Ippon-Datara is among the yōkai gathered around the GeGeGe House, trying to drive Agnès out of the forest. He listens to Medama-Oyaji's warning that if they drive her out then the tragedy Malay yōkai will only repeat elsewhere. Soon followed by Kitarō as he explains how grave the consequences are if Japan becomes a part of Backbeard's empire. This causes the crowd to look at one another. Until their attention is drawn to Kitarō as he stands on his resolve to fight.
On a rooftop, he reads a flier from Nurarihyon, that it is time that all Yokai should stand against humans.
While it is mostly harmless, once per year on December 20, the Ippon-Datara turns violent. Those entering the mountains on that day who run into the Ippon-Datara are squashed flat under its powerful foot. Because of this, December 20 is considered an unlucky day in the areas where this yōkai lives. People stay out of the mountains then.