I think popular but definitely-fictional characters are a good illustration: If the prompt describes a conversation with Count Dracula living in Transylvania, we'll percieve a character in the extended document that "thirsts" for blood and is "pained" by sunlight.

Switching things around so that the fictional character is "HelperBot, AI tool running in a datacenter" will alter things, but it doesn't make those qualities any less-illusory than CountDraculatBot's.