Spark
The Spark usually appears as a flashing ball which clings to groups of pots or blocks. Can be killed in Link's Awakening using the Magic Powder, and in the Oracle Series using the boomerang.
File:Spark TMC.gifQuote from The Legend of Zelda: The Minish Cap Spark figurine:
"Appears in dungeons. They cling to walls and move quickly. Normal attacks may not work, but the boomerang is pretty effective."