Senbei

From OMGWiki

Senbei is the Demon God of Poverty and Misfortune. He gets happier as he makes those around him sadder. Mara uses him from time to time to do her bidding or be a thorn in Keiichi or Belldandy's side. He is supposed to be pretty powerful, but the good fortune brought to Keiichi by having so many goddesses around counteracts Senbei's efforts.

It's kind of funny how Mara talks him up in the anime, because of how worthless he turns out to be. Oh, and he's smaller than a coke bottle. Even worse, he looks like he takes his fashion cues from Michael Jackson.