In Super Mario RPG, there is a mysterious character behind a building in Mushroom Kingdom that gives you different advice throughout the game. Removing the foreground layers in an attempt to see the character reveals that, unsurprisingly, no one is there. Since the character was intended to remain unseen, the designers saw no need to place a sprite.
So, are you living healthy, Zabuza? No alcohol, indulgent foog or drugs? Like a true shinobi?