Have you read The Last Hero? I thought he was rather good in that. Of course Twoflower was with him.
Maybe I'm dense and didnt notice it listed in your title...its late afternoon here and my brain doesnt function well once the coffee buzz has worn off.
I did like the sharp contrast between the two characters. I thought they complimented each other wonderfully.
I think thats the only book I have read with him as a main character though.