I'm just going to be honest, the concepts I was working with were either a Renegade Astartes or a member of the Dark Mechanicus. I have the knowledge and writing capability to do the heavy lifting on an astartes sheet BUT. If we have a cohesive group concept I'm more inclined to write something that fits and will have meaningful connections. Which could still be astartes, but I'm hoping we can coordinate ideas.

Edit: Good to know Cadia Stands currently.