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This mean that the three letters NPC is the best abbreviation for indicating RPG characters in a very general sense. Here the verbal naming sounds as “EN PEE SEE” not as “Non Player’s Character”.

There is an excellent therm in english language which indicates an RPG character: the therm is "RPG character". You're going in circles, my friend.
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In Baldur’s Gate and other games, NPC stands for any character player’s or not.
In other games there are Human Players HP and Computer players CP.
Characters controlled by each are called HPCC and CPCC respectively.
HPCC + CPCC = NPC

There's also NYC for New York City and YMCA for Young Men Christian Association.

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In fact, I would recommend writing N.P.C. to stand for the non-player’s characters to distinguish them from the HPCC.
In a sense N.P.C. = CPCC.
I hope this clarifies the confusion.
Cheers.

Actually the confusion is created by you, mate.
I have no wish to continue this useless and stupid argumentation.
DATD out.