Why are you paying any attention to the character design when you could be looking at that glorious violence in front of you? What are you? Some kind of vegetable eating pacifist? Does the sight of blood scare you? EH!?
On a serious note, it does look a bit like the masterchief armor except more detailed. Rounder in some areas. I'm willing to bet though that if it didn't have the helmet, no one would see the similarities.