Did you know there's also a generic male and female crewmembers in a twinpack? I also bought an extra Dr Chapel and bent the arms and head into a different pose to make a DiFalco (same hairstyle).
You want sad? I bought an extra Rhaandarite set in 1980 because you get only one ambassador and one Starfleet ensign for that set. (Now I have a pair of Rhaandarite ambassadors, one with the head bent slightly!) When I interviewed actor Billy Van Zandt in 1984, he had
no idea the UK had created his bridge character as a tiny metal miniature, so I painted up the spare ensign figure
(still the only Citadel figure I've painted beyond the undercoat!) and
posted it to him. Believe it or not, that little figure even has screen-accurate yellow eyes and black pupils, painted with a magnifying glass and a one-haired brush.
Note that the Andorians (mispelled Andoreans), similarly, come as one male ambassador and one Enterprise crewman. Naturally, the plan was to make the uniformed one into Therin of Andor. I also had plans to do the female ambassador as a custom, although I finally did make one in the Mego 3.75" scale:
http://andorfiles.blogspot.com/2009/09/it-figures-female-andorian.html
Earlier TOS figure supplier, Heritage, did a great set of Tellarites, plus Talosians, Andorians, Romulans, etc, but also did numerous TAS aliens, such a set of Kzinti, some Phylosians and some Skorr.