A non-player character (NPC) in a game is any character that is not controlled by a player. In video games, this usually means a character controlled by the computer through artificial intelligence. The term carries a connotation that the character is not hostile towards players.
NPCs are important in all games, they guide the player and help him throughout his journey, they give you items and weapons and some might even fight along your side.
So as the title says, who is your favorite video game NPC ?