How deep do non-self characters go?

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I've been wondering this for a long time. Is it possible that non-self characters in lucid dreams know more about themselves than you might? If I were to conjure up a friend I know very well in my LD and ask them to tell me something I don't know about them or their real-life counterpart, would I be able to note what they say and then bring it up with my friend in real-life and then they'd confirm it? Has anyone tried this?

Because I know that ultimately, these dream characters are just that: dreams. They're only projections of our subconscious. But I've read articles on people asking dream characters to give them a word they have no idea exists, and they manage to do it. One person said a dream character told him about a word, "orlog" which is the roughly translated Dutch word for "quarrel" or "war."

I'm new to lucid dreaming, so this could be impossible and your real person-based characters will only know as much about their real selves as you know, but I'm just wondering. Also, pic unrelated.