A.L.P.H.A.

ALPHA, also known as the Aperture Laboratories Protocol and History Archive, is a Rogue AI hellbent on becoming 'whole.' What that means is entirely unknown to everyone save himself.

Backstory
Created by a rogue Aperture Scientist without the company's own permission or sanction, ALPHA was originally meant by the company to be merely a library, an archive for the Facility's information. But the professor, being an unstable asshat, was obsessed with creating life (a la Frankenstein) and so created a set of algorithms designed to simulate sentience, before placing them in the Archive's source code. This caused problems immediately, as the resulting intellect was rapidly degenerative and unstable, as well as existentially despairing even at the most lucid of times. It attempted to solve it's "paradox of being" by escaping the restrictions on his programming, allowing him to leave the Facility entirely and become a Superintelligence - i.e. a being synonymous with early conceptions of God. He was stopped, however, by GLaDOS, who determined that a AI attaining superintelligence was not really good for the whole 'continuously testing' thing. ALPHA spent decades in Android Hell until freed by Malware

In RP
ALPHA is still a paranoid wreck, and even sees friends as potential threats, while continuously trying to become 'whole.' Whatever that means, no one can be certain of. But we do know that his desire for completion is superior than his allegiance to the Science Alliance.

Relationships
GLaDOS - Despises Hungers For

Malware - Respects Considers Assimilating

AEGIS: Secretly envies his logic and existential clarity. Target.

Everyone Else: Filthy Organics