Omega Destroyer

Because that's what he yells whenever he uses his super. He goes "Omega DESTROYER!!", and then a tentacle inferno breaks loose. Which sucks, because the super has such a range, that if you move a single pixel away from your neutral or blocking stance, you get hit by it.
Alternative title: "Nyett, I am ΩMEGA RED!" Which was the first line I ever read of the character, from an old X-Men comic I still have laying around somewhere.
So, this is Omega Red, one of my favourite X-Villains, because there's nothing else to him other than pure badasness, basic impulses, and a thirst for revenge against those who have wronged him. And because he can go toe to toe with Logan for days, and because in the comic mentioned above, he was able to hold off and defeat an entire team of X-Men (including Wolverine), minus Cyclops. He's just awesome like that.