Many (belated) thanks. ^^
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Bumping this to post some doodles (not proper refs) of two fiction-based AIs, BarbX and Enkidu: http://fav.me/d9gh2mb (End of the second row. There's lots of other Marathon doodles there, along with other things)
I might make proper refs of them someday, but there's a few other AIs in "The Life and Death of Intelligence" which, IIRC, were coded by an alien race that there is no art of.
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Also, some additional commentary on my Rubicon designs, now that I've completed the Salinger Plank (the one I was most interested in). At the time I drew everyone, I knew very little about Rubicon's plot; Lysander's design ended up fitting him rather well, I think, but Haller and Charlie both had much smaller roles than my art sorta-implies. Whoops.