Frost

Frost is the Quirk used by Rei Todoroki and her children, Fuyumi and Natsuo.

Description
Frost allows the user the capability of manipulating and producing ice around their body.

Rei's possession of this Quirk was what directly resulted in her Quirk Marriage with Enji Todoroki to create a child that possessed a perfection fusion of her and his' Hellflame Quirks. The second and third children, Fuyumi and Natsuo, inherited the Frost Quirk, while the eldest, Toya, inherited a stronger version of Hellflame, but Frost's resistance to ice and weakness to fire. The youngest son, Shoto eventually developed the combination Quirk that Enji so desired, Half-Cold Half-Hot, containing the strength of both Quirks without either of their weaknesses.

Usage
Rei is first seen using this Quirk to attempt to heal Shoto after she instinctively throws boiling water at him. Fuyumi and Natsuo have both not yet demonstrated their capabilities with the Quirk.

Trivia

 * Frost's name was never given in the manga. It is only named as such in the anime.