What are NPCs?
A NPC (Non-Player Character) is any character that is not a PC (that is, taken by a player). Essentially, they are like guest stars, supporting cast, or extras. They might be OCs or characters from The X-Files. Some might be opponents, some might be allies. Players use NPCs any way they want. Everyone is allowed–encouraged even–to write NPCs that others have introduced. When a player quits the game, their character becomes a NPC. OCs that have become NPCs can be disposed of in all kinds of fun ways. Have your character bid him farewell with best wishes for a better life. Or, murder him and throw a joyous party at the funeral.