Maybe Noel represents equality and neutrality? Normal type isn't exactly "biased", in a sense. Also, you say how Anna and Shade speaks in riddles, in a sense, whereas Noel is matter-of-fact, and doesn't seem the person to believe in the supernatural. I doubt that it's a coincidence
Also, it would be interesting to theorize how Shade became....well, the Shade we all know and love.
Maybe it could be some "bargain" with Meteor, where he sold his "body" and the Yureyu building to protect his children, and as a last act of a "dying" father, gave Anna the Amethyst Pendant, and thus becoming the omniscient embodiment of Death in Reborn.
I'm bad at theorizing XD don't judge. Also, I forgot how Anna said she got the pendant. but I vaguely remember she said something about her father (or mother) giving it to her, so please correct me if I'm wrong.