[quote=@jordy0403]
[@Vulkan]
Do you have to make a new faction if you're not part of the others? Or could you just be part of a small, unnamed faction such as one of the resistance cells?
[/quote]

Yes, you could be small and unnamed. You could also just be a lone rebel, who passes between any faction he likes. Thats probably the easiest way to do things if you want to be in the thick of the story with minimal fuss.