Kinda like Infiltrator lately for some reason, and Orbital if it can remove the skull. I like them all for their own little reasons, but I'll probably never ever touch Raider.
As for the person asking if we start with them, no. You unlock some simply by ranking up enough, some are made visible by ranking up but also need a mastery in a particular commendation or something similiar. They are free though once unlocked.
You can remove the skull. I saw an image where there was one of just Orbital, and one was "Orbital (without skull)".