UNSC: Bravo Squad
Harold was the AI aboard the UNSC Battlelore
Harolds physical representation is that of a WW1 doughboy.
Harold was the AI of the UNSC Battlelore. After the infestation of the Battlelore by Xenomorphs Harold was one of the last survivors to be able to tell the story of the infestation and the reproduction and societal make up of the Xenomorphs. His circuitry was damaged by Xenomorph blood and caused him to act erratically. He was secured by Bravo Squad and extricated to the UNSC Red Horse (see Operation Spelunker here and here for more information)