The only other alien race mentioned in Freelancer universe is Dom'Kavash, but they aren't here anymore, plus humans have little to no idea what they really are and if they bear any resemblance to the Nomads.
First of all: try to make your roleplay based on FL universe. It's not about filling blank lines, RP is much more than that kind of template, and Nomads-related RP is one of the most difficult one given that you have to keep it in such way it doesn't contradict original game nor it attempts to give all answers for all questions we had after competition of single player campaign. And secondly: do that in separate thread, please. This thread started as a discussion of upcoming Unit-sk855 roleplay post in his story, not yours.