-
I've had a few experiences with dream characters like this... in one, I asked my mother if I was dreaming. She smiled compassionately and nodded. In another, I laughed at the dream characters. This pissed them off and they (well, really my sunconscious) promised to sabotage my lucidity. Not long after some attempts at scuba diving, I had a very realistic false awakening.
During one really intense dream, I went around asking dream characters to help me wake up. I was panicking and begging them. They would mumble or babble and stare blankly. My one friend squatted on the television and swatted at flies, while others would just walk in strange patterns, fading in and out of sight.
Besides those instances, I don't remember interacting with dream characters much. Usually they sort of fade away.
-
Personally i've never necessarily told a dream character that they aren't real, but I kind of have indirectly. I am a twin(not identical) and my twin was in a lucid dream and I just told him "hey you know this is a dream", and he's like "no it isn't", and i'm like "ya actually it is". Then I took off in the sky. Ha loser non-lucid DC's. They never have as much fun as i do during my dreams.
-
One of three things happens:
a) They think I'm insane.
b) They become hurt or offended.
c) They suddenly act like mindless zombies.