Demon Name: Yonbi No Sokou
Origin(optional): Masashi Kishimoto's Manga and Anime "Naruto".
Powers: The Yonbi No Sokou is a master over Venom (poison) and Wind techniques.
History: Sokou is a bijuu that looks like a reptile. It was a creature that lived near Mount Fuji. Because of the toxic gas and the volcaninc ash, he was transformed into a half-rooster, half-snake monster. The Rooster and Snake are husband and wife in Sokouís body. Everything around it withers away or dies, because of its poison. According to the Legend, whenever he hibernates in Mount Fuji, the snoring he causes will make the volcano erupt. Sokou was sealed by a master of demonic arts, called Yamazaki Ishiro.
Medium(if there is 1): ******* (Taken, but is not allowed to say)