Mack

Mack was a UNSC Artificial Intelligence construct serving planet Harvest in 2525 before and during the Battle of Harvest.

Avatar
His chosen avatar is that of an American cowboy, exactly as those from old western movies from the 20th Century. He is lighthearted and speaks in a southern drawl.

Purpose
Mack is the A.I. in charge of all of Harvest's agricultural operations. These planetary operations include the control of the JOTUN harvesting devices which are used for planting, maintaining, harvesting and packing of agriculture on Harvest, as well as preparing the agriculture for it's journey up Harvests space elevators.

He works adjacent to a separate A.I., Sif, who is responsible for Harvests shipping operations, as well as the Orbital Space Station, Tiara and its seven space elevators.

Flirting
He often would playfully "flirt" with Sif, eliciting strange responses in the female AI, seemingly of hate but tinged with an unexplainable feeling analogous to human attraction underneath. Eventually he reveals to Sif that he is not one but two AI's, his counterpart being an A.I. known as Loki, originally the A.I. of the, a Phoenix-class Colony Ship which transported Harvest's first settlers.

Battle of Harvest
When the combined Covenant Army and Navy force pressed their attack on Harvest, he gave over his control to Loki, transmitting "himself" into the thousands of JOTUN machines below. He instructs Loki to keep Sif safe, but Loki disagrees and believes it to be easier just to destroy her.

Mack versus Loki
Mack eventually rebels against Loki, resisting his attempt to activate a ground-based mass driver, an early, ground based version of the Magnetic Accelerator Cannon, which Loki was trying to use to destroy the Tiara, as well as Sifs data center so that she would not fall into the Covenants hands.

An ONI ship later records Mack's final transmissions, extremely disjointed and rampant words he transmits to the destroyed Sif as the Covenant burn his world. He continues to resist, but as his resources dwindle he makes a last desperate attempt to help his now destroyed "love" Sif by burying her fallen Space Elevators.

Final Transmission
He tries to "Bury your strands so deep their fires can't reach them \ \ and glass them like the rest". His final words are a misquoting of Shakespeare, a habit he had that both annoyed and charmed Sif during their time together.