Chewbacca and Jar Jar were polar opposites, nothing about them rhymed.
Of course Chewbacca and Jar Jar didn't rhyme. Jar Jar rhymed with Han Solo.
The social outcast, in trouble with the law, vest-wearing troublemaker who somehow helped our heroes to find a way around their enemies' position, only to lose hope and have a change of heart during the big battle. Jar Jar in Episode I is Han Solo in Episode IV. And it becomes even clearer once you realize that the original concept for Han Solo was that he was some kind of amphibious alien.