Sewer Al's appearance varies dramatically. The only constant is that he is a relatively small crocodilian. However, there appears to have been a final model for him, seen in early concept art. He is stooped, moderately fat, wearing a suit, but very disheveled with scraggly hair or a toupee. He is warty and gnarled, with crazed yellow-red eyes. This was reproduced in a coloring book, but his jacket was patched and worn in the book.

Sewer Al's appearance varies dramatically. The only constant is that he is a relatively small crocodilian. However, there appears to have been a final model for him, seen in early concept art. He is stooped, moderately fat, wearing a suit, but very disheveled with scraggly hair or a toupee. He is warty and gnarled, with crazed yellow-red eyes. This was reproduced in a coloring book, but his jacket was patched and worn in the book.