A is for Astronauts on some kind of star trek.
B is for Betazoid. Deanna Troi was half Betazoid and the other half Human.
C is for Constable Odo.
D is for Decius, one of the highest-ranking officers aboard the Romulan vessel that penetrated Federation space and destroyed several border outposts in 2266.
E is for Elaysian. What Melora was in the DS9 episode Melora.
F is for the Fabrini people of the multigenerational asteroid ship Yonada. In 2268 their leader was Natira.