I'm glad that even if it was a kind of dark experience in some regards, you're still able to be thankful for it. I feel the same way about my dreams and lucid dreams. Even the lucid dreams that are frustratingly brief, or the dreams that go negative directions, I'm thankful I travel to such weird places each night.
I wonder what that figure you saw meant. It's so bizarre, especially in lucid dreams, that you can encounter things within yourself that you can't even begin to grasp. Thanks for sending this one in, Evelyn!