Ache

The Ache are creatures found in the Legend of Zelda series that resemble Keese. They're essintially a type of bat in the Zelda universe, and are also harder to kill than the Keese. They also have the ability to perform magic, which they use to disguise themselves as regular Hylians. When an opponent approaches them, they'll transform and attack.

So far, they have only appeared in the NES game Zelda II: The Adventure of Link, though multiple other bat type creatures have appeared throughout the Zelda series.