U.M.A. or (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 (Assuming Gokudera's Explanation).
List of U.M.A.
- P.Shitt - Gokudera first called P. Shitt a U.M.A. (Unidentified Mysterious Animal). To this day in the manga, he still calls her that, even though it has been established that she is with the Shimon Famiglia.