There is a large contingent of traitor Space Wolves in my daemonkin warband known as the Fangs of Cerberus.
Cerberus is a greater daemon of Khorne, rumored to perhaps be another name for Karanak himself, who has possessed/corrupted the entirety of the traitor wolves simultaneously. They are mostly a warband we would recognize as chaos space marines, but the more daemonkin-like elements are those moments when Cerberus exerts his control over them. In tabletop terms, this occurs during battle in the form of blood tithe buffs and such.
How they interact exactly with the rest of the Brass Stampede hasn't really been determined yet. I either have time to work on the minis or write fluff, and the former is easier by far for me to achieve something I'm happy with.
First, the counts-as berzerkers. I haven't named the unit yet, but here's the WIP:
Here you can see the black and copper color scheme I'll be using for the Fangs of Cerberus. I've built 20 of them, and plan on using them in the Fist of Khorne formation once my Kharbydis pod arrives.
Trying to paint the unit at the same time, going down the line with basecoat, trim, etc.
They're armed with either dual chainswords or two-handed power axes. Obviously they'll only ever count as close combat weapons/chainaxes. I made an Icon of Wrath bearer and 2 with plasma pistols, just for the hell of it. The champion has an Axe of Khorne, which he may or may not end up using.
More to come: traitor marines