Here is a list of mythical creatures beginning with this letter and I am constantly gathering information from each continent and continually updating.
Abura-sumashi (Japanese)
The abura sumashi is a rare yokai native to Kumamoto Prefecture. It looks like a squat humanoid with a large, ugly head like a potato or a stone. It wears a straw-woven raincoat. Abura sumashi are extremely rare, only found deep in the mountains or along mountain passes in the southern parts of Japan—throughout the range where wild tea plants grow.
Abura-Sumashi is a gentle Yokai, living peacefully with other Yokai and does not want to harm humans. He often helps the Kitaro Family. He is wise and often takes the role of a village elder in most adaptations. They are found in the mountain passes of south Japan and will jump out and surprise unsuspecting travellers.