>>24778185They're a Yukinko, a Namahage, a Yukionna. The Yukinko are snow spirits in Japanese lore that appear in heavy snow and blizzards as children wrapped up in traditional straw snow coats and shivering from the cold. In some myth they either get invited in and kill people in their homes or lure people out to help them where they kill them in the cold under snowfall. Sometimes they are said to be children of Yukionna or Yukionba.
The Yukionna is Japan's multifaceted snow ghost. Most probably at this point in time an amalgamation of various different snow haunting stories. She's a beautiful woman with pale skin, blue lips, and dead black eyes. She appears during snowfall either in white kimono or nude, leaves no foot prints, and lures people out to their cold deaths. Some lore paint her as a natural spirit of the snow, others say she's the ghost of women who died in the cold.
The Namahage are monster from lore native to the snowy regions of northern Japan. Like the Yukinko they dress in traditional straw overcoats, but of an adult or inhuman size. Their most prominent feature is their face which are the subject of wooden folk art masks used in annual tradition. Around the middle of winter it's customary for some men in town to dress up as Namahage, brandish a cleaver and go around knocking on doors asking for trouble makers. It used to be a means of scaring the lazy into work during the cold months so they didn't just laze around the fire. In modern times it's a kind of krampus sans the saint nick, where they go around frightening children and threatening to come back to take them away the next year if they don't start behaving. Since the only notable part of their appearance is the mask it's not surprising that gf just stuck to a floating head in an ice mask instead of giving it a body.
If anything Glailie is the odd one out. And it's a wonder the whole line wasn't ghost from the get go. It's also surprising at least Snorunt wasn't retyped into Ice/Fairy