"The figure of Blizzaria, who was a tomboy, has grown up to become a mature woman. Her gentle smile is like a cool breeze. She seems to be running a small snack shop somewhere in the Yo-kai World."
Yo-kai Medallium biography
"The Shadowside of Blizzaria's body is like the wind blowing across a snowfield. She freezes people, essentially trapping them in a silvery-white world that will never melt."
In her Lightside form, Blizzaria resembles her appearance from the present series, but with more realistic human proportions, and a dark blue obi.
In her Shadowside form, the sleeves and rims of her kimono become longer, and fan outwards, with the former gaining a snowflake pattern. Her hair, as well as her comb's prongs, become longer, too.
Her neckline becomes slightly more open, and her chest appears to be covered with frost.
Additionally, her eyes become completely white, with no pupils.
Blizzaria was mentioned in SS019, as Bruno suggests summoning her to cool the group off. Whisper shoots him down by saying her idea of cooling off would be lethal, though Summer says they couldn't anyway since Tate took the Yo-kai Watch Arcane.
Blizzaria plays a similar role as she does in the anime. Her keystone is one owned by Bruno given to Summer. Once summoned, she seems to recognise Summer and despite not being her friend, agrees to help her. She freezes a crowd of Oni so that the humans cannot be hurt and later creates a large icicle for Jibanyan to throw at the Onimaro Leader.
Blizzaria's Shadowside form in the Chinese version
The fact Blizzaria recognises Summer in the M04 manga - despite them not meeting prior - may be because she is the same Blizzaria as in the original series and knew Nate, her father
In the Chinese version of Yo-kai Watch 4, her Shadowside form's chest is slightly more covered up
