Grey Knights are the core troops of any Daemonhunters army. You can see how I painted my first three Grey Knights on this guide. These three include the Justicar.
As with most Citadel Space Marines they came with plastic backpacks, and in the case of the “normal” marines the force halberds were separate. The models were glued together and the gaps on the bases was filled with green stuff. I then gave them a black undercoat.