No 'I'conography, probably not inquisition
Possibly Callidus Clade assassin but she's in front of you instead of preferred stealth kill
Not nearly enough bladed weapons for a death cult assassin
Imperial Guard officers almost exclusively choose retinue from the Guard
Imperial Navy officers ^
Too much loli in 'goth loli' for Arbites
Not enough goth in 'goth loli' for Sisters of Battle
Adeptus Mechanicus? HAHAHAHAHA- NO
Space Marines? Are you high?

Commissariat- Once you become a full fledged Commissar you're almost required to have a meido of some sort

Good news is that you're probably going to survive this encounter.
Bad news is that you'll only live long enough to be made an 'example', publicly.