diaglo
Adventurer
i've met four DMs in the last 3 years who have had pet NPCs inserted into the party. all the parties were large, so they did not require extra help. however, the DM felt a need to be a player as well as a DM. in 3 of the 4 campaigns it totally sucked.
b/c of the size of the party the DMs scaled up the adventure. as things got too hard for the party, deus ex machina kicked in. NPC killed NPC or solved riddle or cast a spell (even when he wasn't a spellcaster) or etc...mostly we, the players, were sidekicks for the NPC. this is the worst possible scenario you can get in as a gamer.
the fourth campaign worked mostly. the NPC was a filler when not everyone could make it. the DM was reasonable with his judicious use of his NPCs and their abilities. mostly he rotated them. never had the same one for more than 2 sessions.
b/c of the size of the party the DMs scaled up the adventure. as things got too hard for the party, deus ex machina kicked in. NPC killed NPC or solved riddle or cast a spell (even when he wasn't a spellcaster) or etc...mostly we, the players, were sidekicks for the NPC. this is the worst possible scenario you can get in as a gamer.
the fourth campaign worked mostly. the NPC was a filler when not everyone could make it. the DM was reasonable with his judicious use of his NPCs and their abilities. mostly he rotated them. never had the same one for more than 2 sessions.