If you were in trouble or ran afoul of the law, which fictional detective or investigator—from tv, movies, or books—would you want to help you?
Sledge Hammer. He might not do anything terribly helpful, but at least it'll be funny and violently destructive. :)
That's actually not an answer that fits the "afoul of the law" part of the question since he's a police detective. So if I need someone from the private sector, my choice would be The Equalizer for that 80s cool factor. I'm surprised I still remember those TV shows.