White and blue background. One of them also has ice cream.
With a little bit of research, she is Tsurara Oikawa from Nurarihyon no Mago, and she is a Yuki-onna, a snow spirit that would kill or ensnare wanderers during blizzards.
Here's a summary of Nurarihyon no Mago pulled directly from the fan wiki.
A manga series written and illustrated by Hiroshi Shiibashi with an anime TV series adaptation. The main character, Rikuo Nura, is a boy who is part human and a quarter yōkai. He lives in a house full of spirits along with his yōkai grandfather. Despite his grandfather's wish to succeed him as master of a yōkai yakuza clan, he tries to escape his fate of acting like a yōkai by doing good deeds. He eventually comes to terms with his yōkai blood and decides to take up the position of Young head of the Nura House. Multiple factions aim to stop him or overtake his position, and he must gather friends and allies, a new Hyakki Yakō under his banner of "Fear".