Kratos went through numerous incarnations in appearance, most of which included armor. However, the designers felt that the more armor they stripped from him, the more brutal lhe ultimately became. See more
The Gods of Olympus have abandoned me, now there is no hope!
And Kratos cast himself from the highest mountain in all of Greece. After ten years of suffering, ten years of endless nightmares, it would finally come to an end, death, would be his escape from madness. But it had not always been this way, Kratos had once been a champion of the Gods...