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How dreams affect people?
Dreams are usually symbolic, and that is why there's a wide variety of meaning to them. Sometimes they can be tells of how you see another person - I interpreted the dream of someone who viewed another's words and actions as without substance - they knew the person was there and that the person was speaking, but they didn't pay attention to the words and the female herself was invisible in the dream.
If you're dreaming of people you know, apply it as an association, rather than that person directly. Close friend vs. acquaintance, co-worker, husband (or wife), brother - all these have various meanings in how you view another person... or the dream could be using the association of this person to convey a deeper meaning to you - as in the nature of spiritual interpretation.
No visible attributes can mean a lot of things, so dreams with people like that need more detail given to the answerer for any viable explanation at all.