Bubble

Bubbles are undead creatures from The Legend of Zelda series who first appeared in The Legend of Zelda for the NES. They're mainly skulls (seemingly humanoid) with bright red eyes and wings. They're always engulfed in either blue or red fire, and seem to always fly via their wings.

They can not only prove fatal, though some will also deplete Link's magic, or even prevent them from using their items for a short time. In the original Legend of Zelda video games, Bubbles could not be killed, though in later games they could.

They are known by multiple other names other than Bubble as well, including Anti-Fairy, Fire Fairy, Whisp, and Spark'.