Magic-Origin Demon possession could also work. For example, he's a treasure hunter that busts into a recently-discovered tomb while the archeologists are all sleeping that turns out to be cursed?
Just something to toss into the big ol' pot of brain farts while I'm barely awake. 
Sam: "My mind is a swirling miasma of scintillating thoughts and turgid ideas."
Max: "Me too."
Stuff
[QUOTE=The_Robertroid;2779354]Meanwhile, I want the character to embody greed, so I was thinking perhaps some sort of adventurer or thief who found a radioactive meteor of some sort that caused this change, the prolonged life and mind degenerating radiation, creating an embodiment of greed who'se never sated.QUOTE]
He sounds terrible. He's not a character, he's an archetype. Why does he have to embody greed? Can't he just be greedy? Creating absolute characters just restricts you.
Now, starting out with some guy who's exposed to a radioactive meteorite, perhaps one of the ones the Shivans come out of, who was fairly greedy to begin with, but who becomes worse and worse as his mind and body degrade as a reaction to the cellular damage... Still pretty cliched, but at least there's character development.
Disclaimer: The above may be humerous, or at least may be an attempt at humour. Try reading it that way.
Posts are OOC unless noted to be IC, or in an IC thread.
So Im finally making a DP charrie now that i've got my preorder done, and My original idea was to make some sort of Piratesque character, perhaps under a curse or something and having survived to the modern day to become a villain. But I can't seem to finish the idea without ending up cheesy, I also really don't feel like doing /Dark again, im bored of it. I really wanna do DP/Rad but im having trouble comming up with a background to go with my costume ideas. Im great at writing bios and stuff normally, but this one is causing me some trouble. If anybody could offer some insight or ideas to help "Inspire" me so I could get the ball rolling, i'd be very appreciative!
Right now, my current is idea is to perhaps have a character exposed to some material which gave them radiation powers, or a mutation, to explain that power. Meanwhile, I want the character to embody greed, so I was thinking perhaps some sort of adventurer or thief who found a radioactive meteor of some sort that caused this change, the prolonged life and mind degenerating radiation, creating an embodiment of greed who'se never sated. Any ideas to help me create something worth RPing? Or should I scrap and start from scratch?