Something about the savage, dead-eating nature of the kroot has always made me think of them as the archetypical savages of the 40k universe. Though they team up with the Tau and use rudimentary firearms, I picture them being more comfortable with blades and arrows than loaned Tau tech. Somewhere along the line, these ideas fused with the thought that a Tyranid warrior head would make a damn good shield, and then all I could picture was Kroot running around, hiding behind Tyranid armour and throwing scything-talon-tipped spears at their prey.
It was an idea I'd first come up with as something I could fashion for Moloch and his all-kroot Tau army, but when I was trying to come up with something to make for my brother for his birthday, I figured he might like some Kroot Nid hunters.
He's a sculptor himself, and we often argue over which is better: clay or epoxy. He keeps trying to get me to fire things, and I keep trying to get him to give up on such a fragile, labour-intensive medium. He keeps on making me these fantastic things from clay, and yet I've never made him anything, sculpted or otherwise. I thought I'd make up for it this year.
I wanted him to be big, beefy, heavily armoured, and--pretty much--bad ass. Though I presented him to my brother in this condition, he still needs some work. This means that you can still see the plasticard spacers I inserted to beef him up:
The story is that all of these guys' armour and weapons come from pillaging the corpses of dead tyranids. I wanted to illustrate this overtly in a kind of diorama on his base, wherein he has just taken out a carnifex with his looted bonesword, then proceeded to cut out the creature's tongue to use as a whip.
Here's a closer look at the guy's various armour plates and weapons: