I like several of the novels, especially the ones written by people who also wrote for the series. DC Fontana in particular comes to mind. She is responsible for most if not all of the Vulcan mythos, so I feel that you can pretty much take anything she writes as canon.
I had an Idea for an episode of DS9 with Harry Mudd. The basis for it was how Harry got off of the android planet. In my version he created androids of himself and used the confusion to slip away. So did an unknown number of the androids, all believing that they are the real Harry. So my story, which is the back story of the episode, starts with Odo watching Harry exit the airlock and walk into Quarks. He then goes into his office and begins a background check. Later we begin to see the results of that search as an arrest record longer than Odo's arm is revealed, and being a shapeshifter, Odo can have a pretty long arm. Then Odo notices that some of the dates conflict, putting Harry in 2 places at once, and some of them even come with confirmed execution dates. Then Odo finds a file that won't open, resulting in a conference with an Admiral at Starfleet about Mudd's World and the tech there that the Federation wants to keep out of the hands of it's enemies, like the Romulans and Cardassians who would have no moral objection to creating a disposable army to attack with. Odo points to Harry and says "I think you are a bit too late for that."
The point of this story is to open the door for as many Harry Mudd stories as people can imagine, which can end any way the writer wants because they don't have to be the same Harry. It could have even opened the door for a Voyager Harry story.
Now, before you say that's nice but Roger Carmel is dead, yes I know, but you obviously don't know me very well. Considering that I spent 3 years on the SE Texas convention circuit undefeated in my Harry Mudd costume, I figured that as long as I didn't have to say anything, I would be a perfect stand in, hence my ulterior motive in all of this, AND the reason for my screen name.
I also created my own character that I used in a short story I wrote for a college lit class. Got an A by the way.
CCC.