This here is Floki Olafsson. He's based around a Black Scorpion miniatures model, with a couple of simple modifications to "40K" him up.
Little is known about Olafsson before he joined the retinue of Inquisitor Daubenton. He is also a member of Lady Halifax's crew on the Rogue Trader ship Pride of Croydius, and on occasion is known to escort Lady Halifax as part of her personal retinue. He's a busy kind of bloke.
Rumours surround Olafsson. Chiefly, it is said (around the secret circles of moonshine drinkers in the sub-enginarum decks) that he originates from Fenris. And lo, that he was selected by the mighty warriors of the Vlka Fenryka to become an Astartes through the various trials and traditions of that cold world. Alas, the implantation of the Progenoid glands did not take, and his body rejected them.
For a time, it is said that he inhabited the Fang and served in the humiliating (for him) role of a chapter serf, although it is said this is a great honour, the shame must have been nigh-unbearable.
It is not known how he came in to the service of Inquisitor Daubenton and Lady Halifax. However, this service seems to have done him the world of good, as he feels able to take an active role in smiting the enemies of the Emperor with blade and cleansing flame. Indeed, he has developed something of an obsession with fire.