If I was a boss akin to the likes of the Devil Bartender in the 'Dance with the Devil' level from Hitman Blood money, and Vanquish's fast paced movement, cover mechanics and over the top bullet action, in a future-western setting with wild and wacky weapons like an 18-bore 8-barreled shotgun-minigun combo then this:
A large, contrasting as a gigantic figure as compared to the protagonist, tank boss akin to Ganon from LoZ:OoT, but with bullet-hell missiles and junk flying every which way would be this: