If you're looking for one with presence, the nod has to go to IlPalazzo, just for his outfit alone.
If you're looking for one with the mad drive to succeed at any cost, Masami Eiri of SEL fits the bill.
But if you're just looking for someone so evil that the person would steal from others in a crisis and kick them out in the streets afterward (the kicks-puppies kind of evil)...then Seita's aunt from Grave of the Fireflies is at the top of the list.
There's all sorts of villainy...and there's an anime villan for each sort.
