No, this isn't your character species; it's everybody else's character types. The majority of STF characters are probably human but there are many other types too, such as Klingon, Trill, and El Aurian, to name but a few.

I would have liked to write quite a bit about the medical side of the species in the Star Trek arena, but unfortunately, the information is pretty much non existant. In STF, you can look at the IC Library under the GMDept for race information. Also places like startrek.com carry plenty of information about the different races, (again not in a medical sense), although it does contain many diseases and equipment in its library databanks.