I've always liked the space orks from the Warhammer 40k universe. It's like a bunch of English football hooligans scourging space.
I must admit i've also started to really take a shineto the Ferengi after I rewatched star trek DS9, pure capitalism at it's finest!
The builders of Ringworld, our fore fathers. There was also an aquatic alien species in that series that each individual was near enough ro human intelligence but they could form a telepathic chain that amplified intelligence. The problem is the few who could do it were feared and reviled by the normies even though these specials brought them from being scavengers to multi world explorers.