Frostina is a pale-skinned figure with cyan eyes. A small amount of dull, dark blue hair with gray-blue tips is visible under her cape's hood; which is ice-blue with white bubbly texture so far down. She wears a blue kimono with a white band and gold boots.
She was once a little girl who got lost in the mountains and sought a small cave to stay warm. Unfortunately, she possibly died of freezing, becoming the Yo-kai Frostina.
As she lacks true control of her ice powers, Frostina is fairly reserved and shy. At least one Frostina wears a human guise and runs a bar in Downtown Springdale, indicating a level of business and social aptitude.
Frostina has the power over ice and snow, in which she can freeze anything.
In Yo-kai Watch, a Frostina runs a bar named "Frostia's" under a human disguise known as Ms. Frost. She is also befriended automatically at the end of the request "Ms. Frost's Favor".
Hailey, Usapyon, and the hot clan (Blazion, Swelterrier, Swelton, and Sproink) learn that without Blizzaria's Glacial Clip, she is the Yo-kai Frostina. Blizzaria, as Frostina, also tells them how she became a Yo-kai. In the end, the hot clan fail to hide her glacial clip causing the Frostina-turned Blizzaria to freeze them, much to Hailey's amusement and Usapyon's annoyance.
"Frostina" is a combination of frost and Tina, a common girl name.
"Fristina" combines "Fría" (Cold) and "Cristina", a girl name in some american countries.
Frostina is based on the yuki-onna, a youkai typically born from a soul of a woman who froze to death during a snowstorm. They appear as beautiful women with flawless white skin, long dark hair and piercing violet eyes. Their skin is unnaturally cold, and a mere touch will leave anyone chilled to the bones. They will haunt the mountains where they met their end, appearing whenever a blizzard is raging outside and stalking travellers to lead them astray or kill them. Some may even seduce their victims, only to drain their life force and reduce them to frozen corpses. There are also a few stories that tell of a yuki-onna entering someone's home and freezing the people inside.
Rarely, a human can manage to melt their frozen heart and fall in love with them, but these relationships don't always work as yuki-onna have much longer lifespans.
Frostina's random nicknames in Yo-kai Watch 2 are: Rime, Lily, Snoflake, and Yuki.
Yuki is a reference to the yuki-onna. (See Origin)