My favorite detective would be Sherlock Holmes. He is a very detailed detective of his time. Although fictional, yet the character plays a well etiquette persona of quiet sentiments and loud perception of human nature.
There will always be a flaw in every crime, and Sherlock Holmes will find it. His persuasive mannerism takes the culprit by surprise and yet the final verdict is not so surprising or is it?
Sherlock Holmes takes his victims seriously while he takes his subject matters eloquently in a blase mammer.