Not sold on the name, but he's a clay golem with a fire in his belly. Fire belly? Kiln-gut? Chamber core? The pot that walks?
It's meant to look like his body is malleable clay with the head amorphously twisting out of it. His hands (on the other hand...) he's baked in his belly until they're hard. I think the legs are pre-baked to withstand the kiln's weight and heat.
The blue shape behind him is... well I don't know what it is but it makes him present a little nicer I think. There's probably a name for them that I don't know of. Better than a zoom layer and doesn't require actual effort like a background would.
I've had the "internal furnace" idea for a while. My first try was this burly architect but he looked better as a strange alien. Glad I finally got a furnace-belly done finally - I like the imagery.
I'm pelased with the shape of his body. The sketch started out as exploring those curvy hips and stubby legs. The slightly pointed shoulders made me think of clay and so I added the head and then the belly.