Here are a few book series that have a tough, lone wolf hero who actually seems human.
Parker by Richard Stark. 'The Hunter,' 'The Seventh,' and 'Firebreak' Parker is a professional thief. He works with a rotating crew of specialists. Harlan Ellison said that the author was the best writer he knew of.
Easy Rawlins and Fearless Jones by Walter Mosley. 'Fearless Jones' and 'The Devil In a Blue Dress.' Both men operate in LA circa 1946 to 1980. Fearless' adventures are narrated by his pal, a skinny bookstore owner who would rather avoid trouble, but rarely does. Easy is in more books, but they do team up occasionally.
Travis McGee by John D. MacDonald. 'The Deep Blue Goodbye,' and 'A Tan and Sandy Silence.' Trav is a Florida beach bum who lives in a houseboat he won in a poker game. When his retirement funds run low he reluctantly seeks out crime victims who are unable to go to the police. A con man who isn't afraid of a fight.
