I have always loved the idea of the Gamma Mutates, Batman and Spider-Man fight a bunch of animal-themed villains, Iron Man fights armored enemies, etc, it makes sense for Hulk to fight monsters created in the same manner as he. Anyway, that's the idea, but the character is original. I took an Avengers movie Hulk base, Mandroid blades, and a DCUC Nekron head sanded down with a sculpted nose and tumors. I just thought the tumors made sense and would provide a nice color contrast to break up all that green, much the same reason I decided to go with the blue camo pants.