Polvot is a robot powered by gunpowder, which is added in his backpack. He can use such gunpowder to fly like a firework, but that obviously consumes the gunpowder faster.

Oh boy, we're back to the weird energies robots.

Notice how his legs extend to the interior of his chest. In reality, they're connected to the head. As I said, he can fly like a firework, but for that, he needs to hide his legs to not blow 'em up. Without his legs in the middle, his chest becomes kinda like a cannon.

Also, notice it has a tripode inside his head. It allows him to move it's mouth and eyes. Limbs are less robotic, of course (unless you want to look at them like hose arms), but I need it to be dinamic (a robot powered with gunpowder can't be stale), and the hat... is just to give it more personality :))

"Polvot" comes from "Polvo" (dust in spanish), "Polvora" (gunpowder in spanish) and "Bot"