Okay guys but follow me on this, and believe me when I say this is a very stupid idea that I made partially because I'm tired and I think it'd cause at least a little bit of humor.

What if......the Sin of Sloth was a ghost that was so lazy he didn't move on to the next life or what have you? 

His power could be intangibility. Because he's a [i]ghost.[/i]

It works if you squint hard enough and don't ask questions.