Hmm... I can only think of one or two, and you're not going to like them... but in Sandman, Despair was portrayed as a fat, grayish woman with scraggly black hair tied into a bun. Not a main, but an important character, what with her being more powerful and metaphysically intrinsic to the universe than a god and everything.
Another one would be Carmina Falcone in Batman. She's a heavy woman with blond hair, bent on avenging her father's death. Ruthless, cold woman. She gets paralyzed somewhere along the way, and either loses her hair or it was a wig all along, I think...
Neither are portrayed as attractive.
Webcomics, however, do better with fat females. There's a gorgeous portrayal of a juicy Persephone in this series about Hades:
http://deadsquirrelcomics.com/node/773She's on the last page, if you want to find her fast. I think the author has abandoned it. Shame.
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