Copycat or not(though Asura looks more like a copycat of certain comics characters, but whatever), this guy looks to be in a completely different league than Kratos. Strength, speed, durability, you name it.
__________________ And from the ashes he rose, like a black cloud. The Sin of one became the Sin of many.
Kratos just killed the one who cannot die, The Gods.
He chew Gods everyday. That was proven in GoW III where Kratos completely killed The Gods only in a very SHORT TIME.
If he killed them, then obviously they can die. God from one fiction does not equal a God from another one, and here comes the peril of using titles like 'God' or 'Immortal', etc. They mean practically nothing without context. Gods in GoW are fairly powerful beings, yes, but there are plenty of characters in fiction who are just as powerful or even more powerful than the GoW Gods and aren't even considered to be Gods.
In short, we should look to feats and abilities and not titles.
__________________ And from the ashes he rose, like a black cloud. The Sin of one became the Sin of many.
He escaped Hell for many times
In GoW 1, He just refused to die when Ares stabed him with a giant blade rock
in GoW 2, Kratos just escaped from hell for the 2nd time at the beginning of the game
in GoW 3, Kratos entered Hell again and did kill the owner of the hell.
Looks like he really get bored with hell so he just kill the owner where he won;t get dragged anymore by Hades