Chakas (Earth-2042)

"A long time ago, I was a living, breathing Human being. I went mad. I served my enemies. They became my only friends."

- 343 Guilty Spark reminiscing his original form

Chakas was a male ancient Erde-Tyrenian Human born on Onderon during the Forerunner-Flood War. Having lived his youth on Coruscant, then known as Erde-Tyrene, he inadvertently became involved in the Forerunners' schemes due to a midi-cholorian the Forerunner Lifeshaper, the Librarian, had imprinted on him at birth. Although his physical body was eventually killed, his mind survived in the form of the Forerunner Metarch-series monitor droid later known as 343 Guilty Spark.

Source

 * https://www.halopedia.org/Chakas