I have actually seen the auxiliaries of random players who wound up in the same instance as me, it was kind of funny.
As with my auxiliary, she is at the point that if she is not following me on a mission, she will pop-up quite often as an E-Code Attack, good thing I have her well geared up and the right personality class/sub-class combination. Its fun having a Force/Techter that heal and buff spams while still able to actively attack what ever is showing up.
If anyone on ship 4 sees a fox girl auxiliary wearing a blue Alma outfit as an E-Code, its mine or you may see her following me keeping mobs off while I harvest and fish, feel free to make comments. (Too bad we can't add auxiliaries to look books along side our main characters)