Guardian

Guardian in general may refer to dungeon boss guardians in many of the Zelda games:
 * Guardians, dungeon guardians of the Underworld Mazes in The Legend of Zelda.
 * Guardians from the Zelda II: The Adventure of Link
 * Guardians from the The Legend of Zelda: A Link to the Past.
 * Guardians from the The Legend of Zelda: Link's Awakening.
 * Guardians from the The Legend of Zelda: Ocarina of Time.
 * Guardians from the The Legend of Zelda: Majora's Mask (may refer to 'guardian spirits' captured, or the guardians of the dungeons). 
 * Guardians from The Legend of Zelda: Skyward Sword.
 * Guardians from The Legend of Zelda: Breath of the Wild.
 * Phantom Guardians, guardians of the Temple of the Ocean King and the Tower of Spirits.