Avatar

An avatar is the visual representation of an artificial intelligence or "AI", used as a way to better interact with humans. Avatars often appear as human-sized wherever sufficient projection equipment is available. With more limited projection systems such as a starship's holo-pedestal, they appear considerably smaller.

While not used by all AIs, every "smart" AI uses an avatar as do many "dumb" AIs. This visual representation is chosen by the AI upon their creation and can be whatever they desire it to be. The creation of an AI's avatar occurs very early in the system's birthing process, and unless an AI is programmed to have multiple avatars, it does not usually alter its appearance after its initial creation, and attempts to do so have resulted in catastrophic AI system crashes.

Although the duty which the AI is to perform, combined with the human brain that was used to create it, have a great deal to do with what avatar they chose to appear as. Without exception, AI systems identify themselves as male or female based on the gender of their brain donor. In addition to their visual representation, AIs are also able to choose their preferred accent or style of speech.

List of known UNSC AIs and their avatars

 * Araquiel: An elongated skull with long, demon-like horns, fire filled eyes and jagged teeth.


 * Auntie Dot: A grid of glowing, constantly changing symmetrical patterns.


 * Beowulf: A man wearing a hooded cloak that obscures its facial features and most of its body.


 * Black Box: A black box.


 * Cortana: Tall and slender woman, appearing to be nude, albeit censored by symbols across her body, with short-cut hair in Halo: Combat Evolved, then long hair in Halo 2 and Halo 3. She is often described to have calculations faintly scrolling across her body, and resembles her brain donor, Dr. Catherine Elizabeth Halsey. She glows bright blue.


 * Deep Winter: An old man with a snowy cape, often accompanied by holographic ice and snow.


 * Déjà: The appearance of a Greek goddess: barefoot, wrapped in the toga, motes of light dancing about her luminous white hair and holds a clay tablet in her left hand.


 * Endless Summer: A tall, red Cherokee Indian chief, bare-chested, wearing buckskins, and with a feathered spear in hand.


 * FitzGibbon: An elderly 18th century British Army officer with a teal glow.


 * Iona: One of the two known AI with more than one appearance, her default appearance is that of a slender woman with short, curly hair with angular shapes across her body, reminiscent of a skin-tight suit. She also appears to wear boots and knee pads. She has an additional appearance resembling a child version of her default avatar for her more simplistic "ghost" interface to deceive remote scanners. She glows dark red.


 * Jerrod: A tiny spark of light with a formal butler voice.


 * Lysithea: A sweet feminine voice with a laugh that sounds like "fine bone china clinking together."


 * Lorelei: A woman wearing a toga, a sickle in her belt, and a wreath of wheat crowning her head.


 * Mack: An American cowboy from the 20th century.


 * Mo Ye: An elderly Asian woman in a pink gown.


 * Rebecca: She is one of the few known AI to have two appearances. Her first appearance is described as "half-Athena, half-Ares" with a feathered Greek headdress and ancient armor. She then changed her appearance to a flabby, middle-aged Mediterranean woman in a flower dress.


 * Sekmet: Lion-headed woman dressed in Egyptian robes.


 * Serina: A tall and slender woman with long brown hair, wearing black boots, tight pants or leggings and a white shirt. She glows bright blue.


 * Sif: A slender woman with a long neck and elevated chin, wearing an ankle-length, sleeveless gown of "interwoven sunset hues" and has long, golden hair, which falls "in waves to the middle of her back".


 * Superintendent: A series of emotion icons.


 * Watchmaker: An old man holding a large pocket watch with a dozen dials.


 * Wellsley: Stern-looking man with mildly long hair, prominent nose, and a collared coat; supposed to look like an 18th century British officer. Is said to resemble his namesake, Arthur Wellesley, the Duke of Wellington.

Unidentified AIs
There were also at least three AIs at the Damascus Testing Facility on Chi Ceti IV that were have not been specifically identified, with the avatars of a samurai, a mermaid, and a figure made entirely of bright light with comets trailing in her wake.