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The final species in the Klingon Empire, the Orion, are easily recognizable thanks to their green skin tone. Captain James T. Kirk built up something of a reputation for fraternizing with Orion women throughout his career, beginning with his days at the academy as seen in the 2009 Star Trek film.
The pheremones of female Orions can make males of most species incredibly susceptible to suggestion. Vulcans, apparently, are immune to this effect.
Orions have only a single trait, Seductive, that gives them a bonus to confuse and placate resistances and reduces the amount of threat they generate.
Since they have but a single species trait, Orions can choose three additional traits from the pool.
Each of the five Klingon Empire species is unique enough to make choosing between them difficult. In the end, if one appeals to you more than another, then it is probably the right choice for you.
If you're looking to compare the traits of members of the Klingon Empire to those of the Federation, check out our full guide to Federation races in Star Trek Online.