[quote=Psyga315]
This is the guy who is always posted on /a/ with the subject title of "can anyone kill him?"
[/quote]

I'm aware. 

Honestly, it's not that impossible. As he noted in his fight with Touma, that dust explosion did a number on him. While he can redirect attacks, he still needs to breathe. So, it's just a matter of cutting off his oxygen supply until he's incapacitated. Like, for example, if you have fire powers. Just bathe him in flames and burn all the air around him so he can't breathe. Then avoid whatever he throws at you.