U.M.A. (Unidentified Mysterious Animal), are not classified as a specific species of animals nor humans, but they resemble humans physically. They are smart creatures that aren't supposed to do harm to people (except Tsuchinoko), according to Gokudera's explanation.
List of U.M.A.
- Tsuchinoko or Storm Serpent - A Storm-attribute new model of Box Weapon, the Storm Serpent seems to have been created recently by the time of Future Arc. One of the Box Weapons used by Baishana, his in specific is based on a UMA called Tsuchinoko.
- Shitt P.