Earlier today, i was browsing the terminals from the anniversary, and the terminals from halo 4. Then, i had an idea that the monitors like guilty spark, could have been specially chosen forerunners who were put into the monitors bodies by the composer. Since you people seem to be experts on this sort of thing, are the monitors pure AI, or were they forerunners who were put into the monitor's bodies by the composer?
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You're right actually. 343 Guilty Spark was an ancient human called Chakas. He was turned into an A.I and placed into a monitor. You can read the wiki for more information.