it is cool try it.
So... where to start. I've already heard plenty of GMs try to make excuses for this practice, so I'm going to put a different spin on this. Have any of you ever been a player in a group where the GM used as NPC as a stand-in PC and approved of it?
In my own experience, the practice is generally reviled, as is the similar practice of occasionally putting the PCs in tough situations in order to have an extremely powerful NPC/Mary Sue pop out to rescue the group. Most GMs I've known who had a pet NPC used them as a Deus Ex Machina to make sure "their" story did not go awry. The others were the type who probably didn't even want to be GMing in the first place - hence their focus on controlling a single character when they had a whole world at their command.