Oooh, what to do? Would I go the sadistic and evil route and bring to life The Psychotic version of The Lone Wanderer, or unleash Elizabeth Greene or the Queen of Blades on everybody? Seeing the end of the world would be fucking awesome. ^ ^
But, if I wanted to take the lame route, "Because I'm a fan" route...well...
The Wicked Witch of the West. Preferably her re-imagined younger version, since she's less likely to set me on fire.
Don't ask why. I'm just obsessed with The Wizard of Oz and all its offshoots.