Mammon from the Spawn Comics
Mammon is presented as a minor and somewhat ineffectual Demon Prince who is too obsessed with money to have properly cared for his infernal holdings. To me this is utter poppycock. All it takes is one look around to see that money and greed run things regardless of whether you are a have or a have not. It is not the only force that runs things, but it certainly is not an also-ran.
Book of the Neglected 