As far as females go? What about Madam Xanadu?
Fuck, Madam Xanadu does nothing but sit around all day! You could easily make her fat. And if you did it right you could actually make her pretty intimidating as a fatty, too. Make her big and voluminous and wrapped in shadow. Give her a bit of a stone idol vibe, like she's a fertility goddess brought to life. She sits there, solid and vast as a mountain, and sees and knows all things. It could work.