NPC doesn't have to be a figure of a person, like RPS characters. They are just one type of NPCs. For example, the RPS movement itself is an NPC. The juggle item is an NPC. The jump rope item is an NPC. The /sit command is an NPC.
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The quote you posted from wikipedia is just explaining how NPCs react to things. And RPS, juggle, and jump rope are ganis, not NPCs.