There’s no such thing as the three ranks of NPC in this world. That is something that I made up for myself to make it easier. The three ranks of artificial intelligence can be categorized as regular AI NPC, advanced AI NPC and the super realistic AI NPC. As for the regular AI NPC, those type of NPCs are the one serving on the facility such as the restaurant, shop, and many more. This kind of NPC aren’t doing anything notable as they are only programmed to do basic task. Second, the advanced AI. This kind of AI is able to answer to your question and do some calculation based on the context. This kind of AI is used for the system. The way it answered to the basic question, operate the shop, and so on is more flexible compared to the regular AI but it still isn’t the cream of the top. Last

