More importantly, Vimes is always determined to maintain himself and those under him as officers of the law (even though no one knows what the law actually is) who do not (for example) just kill the accused, even if ordered to. This becomes very important in many books, including Jingo, Fifth Elephant and Night Watch.
He's still the coolest character listed, though.
The two most common things in the Universe are hydrogen and stupidity. -- Harlan Ellison