SHODAN (System Shock 2)

SHODAN (Sentient Hyper-Optimized Data Access Network) is the main antagonist in System Shock 2, an AI from the first title System Shock which I've only had the pleasure of playing a demo of.  That said, the interface of the first incarnation was near impenetrable and prior to the now standard mouse+keyboard set.  That being the case, all my SHODAN character knowledge pretty much comes from SS2, apart from snippets from around the web.  Essentially, as all AI do it would seem, she goes insane and sees herself as a goddess to the insects (read, us) of Earth and wishes to inflict her will on us.  She is stopped and assumed defeated/deleted in the first game but obviously due to System Shock 2, not entirely.

In the second instalment, the protagonist unwittingly becomes her avatar through whom she can save herself from an organic life form that is being formed from the flesh of the crew after they found something during the maiden voyage of first near light speed ship. The life form is SHODAN's "unruly children", a by-product of when she escaped in SS1 and they want to destroy her for being a cold machine and so arrogant.  This life form also wants to absorb mankind into 'the many' to enjoy the warm embrace of nothingness, so it's in our interest to stop them too, despite SHODAN being utterly insane and evidently still wanting to enslave all life in some similar manner.  Aw, ain't it cute when kids turn out like their parents?  Anyway...

SHODAN's voice is not the easiest to capture in writing.  It's essentially three differently pitched voices speaking as one, with occasional 'computer glitches', whispers, 'flange' effects, and sporadically (though usually at the most impactive part of her threat or taunt) one of the voices will go out of sync, so you just get a deep voice or just a high voice re-iterating her last words.  It's part of what gives the AI her disturbing persona.  Best I've come up with so far is to use a standard system, so hopefully (with a bit of knowledge about the franchise from the reader) it will read in some way like her.

“Your tiny insect minds – INSECT MIIINDS, tiny minds – c-c-c-cannot comprehend the vastness of my influence. iiiiinfluuueeence...”

Similarly with GLaDOS there is sometimes an impatient, pushy mother tone to her when you complete an assigned task.  One of my favourite in-game lines of hers is when you conduct such a task:

"I enjoy watching you work, insect."

There's a manic enthusiasm when she says it, and you're not sure how worried you should be.  Very, it turns out.