Shrek .

One of the themes of Shrek is that beauty is only skin deep. When Princess Fiona  was rescued from the tower by Shrek, she insist that he is not her Prince Charming. He's an ogre, not a beautiful Prince. Shrek and Fiona are not ideal, or what society would deem as beautiful, but they're good, sweet, nice characters who show that you don't have to be beautiful to everyone else to be truly beautiful. The moral of the story is that looks do not matter, it's about what's on the inside.