Watching Shrek IV, it occurred to me that Shrek actually fits quite well into the TV Tropes standard character list. Just not where you might expect him to fit.
He's the Smart Guy (
http://tvtropes.org/pmwiki/pmwiki.php/Main/TheSmartGuy). He is consistently the most intelligent and imaginative person in that story universe, perhaps matched only by his wife Fiona. And, by Ogre standards, both he and Fiona are quite small.
(By human standards, of course, he'd be the Genius Bruiser (
http://tvtropes.org/pmwiki/pmwiki.php/Main/GeniusBruiser)).