U.M.A. (Unidentified Mysterious Animal). They are not exactly human, but they resemble humans physically. They are smart creatures and aren't supposed to do harm to people (except Tsuchinoko), according to Gokudera's explanation.
List of U.M.A.
- P.Shitt - Gokudera first called P. Shitt a U.M.A. To this day in the manga, he still calls her that, even though it has been established that she is with the Shimon Famiglia.
- 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.