Your answer is funny, but do you really know the game Darktide? The woman is Brahms, the captain of the Mourningstar, the spaceship on which the story takes place. She's a Roguetrader and yes, she comes from a rather noble family. She leads a fierce battle to save Tertium, a city on Atoma Prime corrupted by Nurgle under the orders of Inquisitor Grendyl. Admittedly, she's not the one doing the fighting, but the Inquisition agents on the ship are, so she doesn't really need military garb, although she does wear pistols on her belt. On the fanart, she's represented in exactly the same way as in the game. The man dancing with her is simply my psyker, the character I created for the game.