When saying someone is going to burn in hell just isn't strong enough, go with hell kindling. This would be the sort of individual that the rest of hell's residents would rather not be associated with, the sort that burns even easier than the others. When they show up, the rest of the damned would be like "Damn! Did it just get hotter in here?" What gets the hellfires started quicker than anything else? Hell kindling.
"That Bernie Madoff is just the sort of hell kindling that will stave off a cold day in hell."