U.M.A. (Unidentified Mysterious Animal) are not classified as a specific species of animals nor humans, but they resemble humans physically. They are intelligent creatures that aren't supposed to harm people (except Tsuchinoko), according to Gokudera's explanation.
List of U.M.A.
- Tsuchinoko or Storm Serpent - A Storm-attribute Box Weapon, the Storm Serpent is one of the Box Weapons used by Baishana. It resembles a Tsuchinoko.