Star Trek: Know your Aliens, part 2
As Ginsberg pointed out, I neglected to include Romulans in my last post. (I left them out because they didn't figure much in the original series, but I forgot that they appear in the Star Trek movies.)
Romulans look much like Vulcans (upswept eyebrows and pointy ears). They're actually related to Vulcans, but they don't follow the Vulcan philosophy which embraces logic above all else.
Romulan society highly values honor, especially through military service. Unfortunately, they're also highly xenophobic / racist, so they don't really respect or value other species. They also have the reputation of being duplicitious even within their own society, with Romulan citizens living in fear of the Romulan Secret Police (the Tal Shiar).