Yin and Yang are demons who seem to have a fox like appearance while still looking half human,both of them together actually brings less balance due to them being locked away by their “master” Klara,years ago,they do not have parents though a plant goddess adopted them but she has passed away now leaving them all alone. They do not have genders though have a feminine look, yin represents passive,receptive, and introverted traits,while yang signifies active, assertive, and extroverted behavior 