Yurl is the main trader in Kyakukya. He is found in the northwest part of town inside the fenced off area.
Try not to lead any hostile enemies back to the town near Yurl. This can lead to him summoning various plantlife around town. This causes a mess of things and can turn villagers against each other.
On the other hand, this can be beneficial. If Mayor Nuntu dies, he will drop the Corpus Choliys, saving you the water required to purchase it. If Svenlainard dies, you gain access to both Polluxus and Caslainard, as well as his other items.