Here is a list of mythical creatures beginning with this letter and I am constantly gathering information from each continent and continually updating.
Asanbosam (West Africa)
The Asanbosam, or more commonly Sasabonsam, is a vampire-like folkloric being from the Akan people. It belongs to the folklore of the Akan of southern Ghana, as well as Côte d'Ivoire, Togo and 18th century Jamaica from enslaved Akan. It is said to have iron teeth, pink skin, long red hair and iron hooks for feet and lives in trees, attacking from above. In the forests of West Africa, there were rules of renewal, and the Sasabonsam would enforce these rules.
They take up territory in the trees in the forests, where they live and feed on people that wander into their home. It becomes a territorial aspect for them. While being humanoid, these creatures have bat-like features. Sasabonsam resemble bats well, such a feature would be their wings, which are near 20 feet long.