As I keep researching the various races allied with or conquered by the Dominion, I am finding more unique races within the faction. If you would like to be different than the norm. Open up different roleplaying opportunities, here are some options.

Cardassians

Jem'Hadar

Vorta

Hunters (Hirogen)

Skrreea http://startrekborderlands.com/alien_races_s2.shtml

Dosi http://startrekborderlands.com/alien_races_d3.shtml

Karemma http://startrekborderlands.com/alien_races_k1.shtml

T-Rogorans (conquered 2370) http://startrekborderlands.com/alien_races_t1.shtml

Yaderans (conquered 2340) http://en.memory-alpha.org/wiki/Yaderan

Valerians http://en.memory-alpha.org/wiki/Valerian

Klaestrons http://en.memory-alpha.org/wiki/Klaestron

S'ona http://planetside.firenebula.com/startrek/races.php

Tarlac (Subjects of the S'Ona Empire) http://memory-beta.wikia.com/wiki/Tarlac

Ellora (Subjects of the S'Ona Empire) http://memory-beta.wikia.com/wiki/Tarlac