I didn't even notice that the lower half of his body was a tree at first! He reminds me of Link. I really like this style that you have. I don't think this guy even has any visible flesh. Then again, I don't know if he could have any kind of flesh at all. He just seems to be a rainbow of colors.
The bloody sword is a great touch. He's apparently immobile, so I don't know how he'd fight. Apparently, he's just a protector. Well, I guess that's what a guardian essentially is. I can't tell if those are horns or part of the tree.