Humbug is will to go above and beyond to help his friends. He is brave and courageous, and he puts the needs of others before his own. He might not get everything right... but his heart is always in the right place.
I would call on Rhyme and Reason to help facilitate the quarrel, and then I would have a long talk with the two about the importance of both words and numbers... the way they can work together.
The Phantom Tollbooth study guide contains a biography of Norton Juster, literature essays, quiz questions, major themes, characters, and a full summary and analysis.