Gyudo-kun (ギュードくん, Gyūdo-kun) is a character in Heion Sedai no Idaten-tachi series.
Gyudo-kun is a huge demon with two horns and long mouth. Its hair continues on its back, shoulders and top of his chest.
Gyudo-kun is a huge demon sleeping in the northern glacier. Contrary to the figure, it is a herbivore and is the weakest class as a demon. Immediately after waking up, he attacks Hayato and his friends, but Hayato's full-scale attack destroys his heart and kills him. The corpse is sent to the laboratory by Ysley, but the results show that it is difficult for humans to kill it even if they fight properly.