Additionally, all fighters and a few freighters (list is on the Ship rules pages) can be NPCed, meaning you can set them to NPC controlled and they will follow your ship (if it's of the same type). No actual NPCs are necessary for that at this time.
Some are partially implemented and others are not implemented(Unusable and just for RP purposes for now). But this game is still in beta and as new code is implemented, droids become more usable.
To find which ones are useable, click on the link below, and notice the icon on the top left of the Driods avatar. Hope this helps a little.