Origin
Yuki is the twin daughter of Tatsu Yamashiro, Katana, and Maseo Yamashiro who was burned to death in their house by Takeo Yamashiro. Their deaths send Katana on her quest to be a samurai and superhero
Blackest Night
Yuki is later revived by a Black Power Ring, along with his twin Reiko, and fights Katana, Halo, Creeper, and Killer Croc. They are eventually killed by Halo who uses light to do so.