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Come on now DATD there is no reason to be rude to a friend.

I WILL KILL YOU!!!! NOT. <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" /> <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" /> I realise I was a bit harsh yet I can point out my mistakes.
<img src="/ubbthreads/images/graemlins/wave.gif" alt="" />
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Is it not true that the Acronym NPC stands for Non-Player Character?

Yes but it also stand for:

National Panhellenic Conference
National Parks of Canada
National Peanut Council
National Pensioners Convention (United Kingdom)
National People’s Congress (Chinese Legislature)
Nauru Phosphate Corporation
and such <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" /> <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />

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The only well-defined difference is control; if you can control a character, it must be a player’s character, and if you may not control it then it is an NPC.

I disagree, friend, but after all, I think it's not important: I guess NPC is different for everyone.
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Take for example Blizzard’s War Craft III, in each episode, you control several characters and many created army forces. How can you explain your conception of player’s characters hence?

At the beginning of each campaign, the game 'points' who is the player: in the human campaign, he's the paladin. He is the fallen paladin in the undead campaign, the young propheth Thrall as the orcs and finally the priestess for the elves.
The player character is the one called "you" in the game. It's the child of Bhaal in Baldur's Gate and the character you make in <img src="/ubbthreads/images/graemlins/div.gif" alt="" />. It is the 'good' character in <img src="/ubbthreads/images/graemlins/riftrunner.gif" alt="" /> as the description says You get your soul bound with a deathknight. Which means you are not the deathknight.

In this discussion I finally understud for myself what is an NPC and what is a PC.
Thank you, DAD.