Halloween

Halloween was the shadow of September and is the ruler of Fairyland-Below.

History
Halloween first gained a will of her own when September chose to give her up to the Glashtyn to save a Pooka girl. Halloween was sawed off September's back, and taken by the Glashtyn, who claimed that since she had been freely given, she was their only true possession and that they'd take good care of her.

However, it is later discovered that while the Glashtyn had meant what they had said, they had taken her to Fairyland-Below in the hopes that she would awaken Prince Myrrh, and help him gain the throne, which she had refused to do, instead taking the rule of Fairyland-Below herself.

Once she was Queen of Fairyland-Below, she began to take the shadows of everyone, including A-Through-L, Saturday, and even Owen, September's father. This caused everyone in Fairyland to lose their ability to use magic, as all magic came from Fairyland-Below.

September arrived in Fairyland-Below to challenge her and return the shadows to their owners, however, the shadows refused to obey, enjoying their newfound freedom, finally able to do things of their own, no longer bound to simply imitate the movements of their owners and not have a voice of their own.

Later on, she was left by September to rule Fairyland-Below, as September realized that now that the shadows were free, they were better off that way, and a machine created by Belinda Cabbage called The Sameness Engine could create replacement shadows for those whose shadows had chosen to remain free.

Halloween later on participated in the Cantankerous Derby for the royal crown.