Herobizkit
Adventurer
I have to chime in here.
The above poster's idea of an "attached NPC" is pretty much a DMPC in games that I've run. My DMPC is almost always a support character, or a one-trick pony that fills a gap in the other player's abilities.
That said, the only thing you do not do with such a character is treat him any better than any other PC (that is, as if you were playing the character under another DM). Treasure should be rolled for as usual, or in the case of pre-gen modules, doled out to the party as is with no special tidbits for your DMPC. You can always SUGGEST that items be given to your DMPC, but leave that decision to the players. If you make a spellcaster as a DMPC, be certain that said spellcaster is up front with his spell selection, and again, try to specialize so that the players know that you're not trying anything shifty (ie "conveniently" having the one spell they need, even if it's not on your character sheet).
And really, it's all about trust; if the players can't trust you to run a DMPC fairly, NPC him and live vicariously through the NPC's deeds.
The above poster's idea of an "attached NPC" is pretty much a DMPC in games that I've run. My DMPC is almost always a support character, or a one-trick pony that fills a gap in the other player's abilities.
That said, the only thing you do not do with such a character is treat him any better than any other PC (that is, as if you were playing the character under another DM). Treasure should be rolled for as usual, or in the case of pre-gen modules, doled out to the party as is with no special tidbits for your DMPC. You can always SUGGEST that items be given to your DMPC, but leave that decision to the players. If you make a spellcaster as a DMPC, be certain that said spellcaster is up front with his spell selection, and again, try to specialize so that the players know that you're not trying anything shifty (ie "conveniently" having the one spell they need, even if it's not on your character sheet).
And really, it's all about trust; if the players can't trust you to run a DMPC fairly, NPC him and live vicariously through the NPC's deeds.