Im not realy a Star Trek Person I mean my only favorite one is Star Trek Enterprise Couse that is the only one i saw while flipping through Channels and it happend to be on SyFy. So Anyways i have no clue what these races are. How there Personality is or just what makes them interesting. All i know is T'pol who is very emotionless very secretive and i liked that so i assumed that is how Vulcan is

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http://www.startrek.com/startrek/view/library/aliens/index.html
All alien races listed alphabetically.