Inkbrand would totally be "that guy" who participates in Nightmare Night with a bedsheet thrown over his head, just because the ultra simplicity and cliched-ness of the outfit would be a costume in and of itself. But I kind of wanted a more "serious" costume for him this year, and after brainstorming a bit, finally decided on Commander Shepard from Mass Effect.
...Oh sorry. Mares Effect, the super successful three-part Bridleway saga that had you spellbound, enchanted, eager for more, and speechless in incompetent rage at its color-coded finale.
(Honestly, I didn't think the ending to the series was that bad, but it definitely wasn't stellar, either).
Also, credit goes to this picture for the conceptualization of the outfit, because there was no way I was attempting to mold an N7 uniform onto a pony's body from scratch.
Commander Shepard and Mass Effect (c) Bioware-I-freaking-love-you-just-take-my-money-now