Chakas (Earth-4001)

04-343 Guilty Spark, initially known as Monitor Chakas and known to the Covenant as "the Oracle", is a Forerunner monitor that was originally tasked with maintaining Installation 04. Originally an ancient human known as Chakas, Guilty Spark played an important role in the ancient Forerunner-Flood war, as well as the modern-day Battle of Installation 04, the heretic uprising within the Covenant, and the events that transpired on the Ark during the Battle of Installation 00.

History
The history of 343 Guilty Spark is the same as his mainstream counterpart up until the end of the Human-Covenant War in March 2553.

Personality & Traits
After a hundred thousand years of isolation, 343 Guilty Spark was quirky, detached and analytical. For Spark, protocol dictated all; the slight emotion he showed for the death of an ally was truly grief only for the inconvenience of finding another to assist him. While he gladly assisted those who requested his help, if his allies decided to prevent him from completing necessary actions - such as the firing of his ring - he would turn on them without hesitation and dispatch them with lethal force.

Tens of thousands of years of monotonous duty spent monitoring his installation and waiting for a Reclaimer appeared to have had a significant effect on the Monitor's sanity. Spark showed many characteristics of rampancy. He loved to learn and to take records, even in the face of his installation's imminent destruction; accessing the Pillar of Autumn's shipboard databases, he was intensely fascinated about finally having access to human history up until that point, referring to the record as "all of our lost time." He also showed other odd behaviors such as humming and singing. Typically, he was also untroubled with matters of life or death. When Sesa 'Refumee and Tartarus were killed by the Arbiter, he appeared casual, although he was remorseful when Sesa 'Refumee was killed. Spark's detachment resulted in a tendency of rarely giving more information than he had to. For example, on Installation 04 he merely told John-117 that activating the ring would stop the Flood, neglecting the portion about how all life in range of the ring would be wiped out to do so (although he may have been genuinely unaware that the Master Chief was completely oblivious to any of this, assuming the Spartan to be the IsoDidact). Likewise, he did not tell the High Prophets that the ring was a weapon when asked about the location of Installation 05's Index, only telling that truth to the Covenant when asked directly by the Arbiter. While bound by protocol, Guilty Spark seemed to genuinely enjoy the prospect of firing the Halo Array, unlike his fellow Monitors such as 049 Abject Testament.

Although created from the essence of Chakas, 343 Guilty Spark became his own entity after his conversion into a monitor, often referring to his past human self as a separate being despite retaining Chakas' memories. This was the result of a number of factors, including the combined wisdom of the numerous human essences stored within his reborn self, the immense amounts of added knowledge and programming to enable him to effectively perform his duties, as well as the mental trauma Chakas suffered in his human form; he himself stated that he "went mad". The suppression of most of his memories and knowledge upon his assignment to Installation 04 in the name of compartmentalization further diverged him from his original self, in addition to his primary personality array splintering to numerous fragments over tens of thousands of years.

As a Forerunner AI, 343 Guilty Spark possesses highly advanced abilities with electronic systems As with UNSC and Covenant artificial intelligences, Guilty Spark's programming prohibited him from carrying out certain actions. He cannot, for example, retrieve the Activation Index from the Library or use it to activate Installation 04, instead requiring a Reclaimer to carry out this task.

Spark's protocol bound him only to contain a Flood outbreak from Installation 04, so when Installation 04 was destroyed, his directives were also terminated. This means that he no longer had a priority prescribing his actions concerning the Flood - he was free to make choices concerning the Flood, as he did on Installation 05 when he assisted in the deactivation of its firing sequence, risking the containment of a Flood outbreak. According to Spark, the loss of his ring left him with only one purpose: to aid the Chief as a Reclaimer, which Spark admitted was something he should have done from the beginning instead of trying to hinder him. This caused the two to put aside their differences and Spark to join forces with the Chief again against the Flood and the Covenant. Due to his abilities in connection with the Halo Array, Spark proved to be a powerful ally and seemed to take commands from Commander Keyes, Sergeant Johnson, and the Master Chief without hesitation as part of his new function in life. When he discovered Installation 08, his priority protocol reactivated, and he adopted the ring as his replacement. When Sgt. Maj. Johnson declared his intent to fire the Halo, which would destroy it, Spark unhesitatingly killed him. Despite his treachery, it is unlikely the UNSC would have been able to prevent the premature activation of the Halo Array without Guilty Spark's assistance.

Trivia

 * The only person who ever refers to 343 Guilty Spark as "343 Guilty Spark" is himself, when he is introducing himself. Others refer to him as "The Oracle", or "The Monitor" when speaking of him, or even shorten his name to "Spark", or once "Robot", to which 343 Guilty Spark protested against, and also "Tinker Bell" by Avery Johnson in Halo 2 after he asks about where to activate the rings while in standby mode and answered sarcastically. He has also been called "Light bulb" by Johnson in Halo 2 (to Tartarus: "Please...Don't shake the light-bulb.") and Halo 3 ("A tank's a tank, light bulb.").
 * 343 Guilty Spark shoots a beam similar to both the UNSC Spartan Laser and the Forerunner Sentinel Beam. When comparing power through hacking or modding, the beam is noticeably weaker than a Spartan Laser but much stronger than a Sentinel Beam.