I have no proof, because I was too slow to hit the screenshot button.
In the "Scared to Death" prestige mission, I freed the trapped knight, and he said the thing he normally said. However, behind this chat bubble I saw just the top of what looked like "Cherub". (In red)
Is this my imagination? I hope it's not...as a robot, having an imagination would be a serious defect which would mark me for immediate scrapping.
it was found some time ago.