Creative Minority Report posted that the cast of Gilligan's Island were each based on one of the Seven Deadly Sins. The breakdown went like this:
The Professor – Pride
Thurston Howell III - Greed
Ginger - Lust
Mary Ann - Envy (of Ginger's looks)
Mrs. Lovey Howell - Gluttony
The Skipper - Anger or wrath
Gilligan – Sloth
If that's true it makes me feel bad for laughing. I think its a bit of a stretch though. For instance, Mary Ann never seemed especially envious.
The article is here. You can judge for yourself.