Aja, the Neckless (Patreon)

As a child, Aja thought she was a normal girl, until she visited her grandparents, Shinto priests at a rural shrine in Japan, who warned her that she wasn't as ordinary as she seemed. Sure enough, one night in her teens, she woke up to find her neck had vanished. She was actually a nukekubi - a yokai from Japanese folklore that had their head detached from their body. Her grandparents had prepared her by creating an enchanted choker that makes her appear to still have a neck when worn. With practice, she can will her head to move around through the air, though she typically keeps it in the "normal" position. 

Original Charater from @Rikka