U.M.A. are neither classified as animals nor humans, but they resemble humans physically. They are intelligent creatures that aren't supposed to harm people., per Gokudera's explanation. Gokudera hopes to someday meet one of them.
List of U.M.A.
- Serpe Tempesta - A Storm-attribute Box Weapon is one of the Box Weapons used by Baishana. It resembles a Tsuchinoko.