Bubble

Bubbles are floating skulls often shown wreathed in fire. Their name likely refers to their circular shape in earlier titles. Originally, they were depicted mostly as an obstacle, though they have since been depicted as an enemy. In some games, contact with a Bubble can curse Link, causing him to be unable to use his sword, and in many later games, their fire and ability to fly can be removed, causing them to hop around defenselessly on the ground.

The Legend of Zelda
In The Legend of Zelda, Bubbles appear in a few rooms starting with the third labyrinth, Manji. They rapidly flash between the game's four palettes, and as such look slightly different in every labyrinth, as well as if Link has the Blue Ring or Red Ring. If Link touches one, he will be cursed temporarily, losing the ability to use his sword until it wears off. Bubbles cannot be defeated in any way.

In the Second Quest, Bubbles that appear solely as blue or red appear in some rooms. In this case, the red ones curse Link permanently until he touches a blue Bubble or leaves the labyrinth.

Zelda II: The Adventure of Link
In Zelda II: The Adventure of Link, Bubbles again appear as obstacles. They are only half Link's height and no longer curse him, but drain some of his Magic Meter instead. They ricochet around the rooms diagonally, but temporarily stop when Link attacks one with his sword. They can be defeated, but take an enormous amount of hits. Giant Bubbles also appear.

The Legend of Zelda: A Link to the Past
In The Legend of Zelda: A Link to the Past, Bubbles are called Fire Faeries in the Super Nintendo version and Anti-Fairies in the Game Boy Advance version. They are depicted as small skulls with red circles spinning around them, and are a very common dungeon enemy. They once again bounce around rooms diagonally and drain Link's magic, but if Magic Powder is sprinkled on one, it will turn into a faerie. A group of four appears in one part of the Eastern Palace, guarding a pot over a switch, but can be scattered once all the other enemies in the room are defeated.

The Legend of Zelda: Link's Awakening
In The Legend of Zelda: Link's Awakening, Bubbles have a similar behavior and appearance to those in A Link to the Past, and they retain their name, Anti-Faerie. However, they are less common, and have no other effect from being touched than simple damage. Magic Powder burns them, but does not change them into a fairy, with this trait being given to Spark, which is more common in this game.

The Legend of Zelda: Ocarina of Time
In The Legend of Zelda: Ocarina of Time, Bubbles are depicted with wings to fly with, and can be defeated much simpler than before. Their fire appears in a variety of colors, with the behavior changing based off of that.

Blue Bubbles are first found in the Forest Temple, and attempt to fly at Link to burn him. While flying, they occasionally make buzzing grunt-like sounds. If deflected with the Hylian Shield or Mirror Shield, they will lose their flames and hop along the ground, at which point they can be defeated. They can also be defeated while in flight with an arrow. If a Bombchu is released near an active Blue Bubble, it will frantically chase the Bombchu.

Green Bubbles are also first found in the Forest Temple. They follow a preset path, with their fire occasionally disappearing by itself. When the fire is out, they are vulnerable to any attack. Large ones also appear in the Bottom of thee Well and Ganon's Castle, though the game makes no differentiation between them and the normal-sized ones.

Red Bubbles first appear in the Fire Temple, and normally only appear from lava. They jump around randomly while making hoarse laughter-like noises when Link approaches, eventually going back to the lava. They can be deflected with a shield, but their speed and movement pattern makes this difficult. In Master Quest, they sometimes appear elsewhere, notably from the floor in a child-only room in the Spirit Temple, where most of Link's arsenal is absolutely useless against them.

White Bubbles only appear in one room in the upper levels of the Spirit Temple, and are notably the only enemy absent from Master Quest. They act mostly like Green Bubbles but lack any fire at all, instead trailing a white blur. very so often, they stop and spin in place. Despite being the final type introduced, they are the simplest to defeat.

Of note is that in the original, all Bubbles' eye color is determined by Link's current tunic color. In The Legend of Zelda: Ocarina of Time 3D, they instead all have turquoise eyes.

The Legend of Zelda: Majora's Mask
In The Legend of Zelda: Majora's Mask, only Blue and Red Bubbles reappear. Blue Bubbles appear at night in Termina Field and Ikana Canyon, as well as a passageway in the Stone Tower Temple when it is inverted. They look and act as they do in Ocarina of Time, but no longer pursue Bombchu and are now capable of cursing Link. When cursed, Link turns slightly blue and cannot use his sword. The curse can be waited out or instantly dispelled with a Blue Potion or the Song of Storms. Red Bubbles appear at the bottom of the central room in the Snowhead Temple, and act exactly like they do in Ocarina of Time. If they are all defeated, a treasure chest appears.

In the original, all Bubbles are given red eyes, though in The Legend of Zelda: Majora's Mask 3D, they are turquoise, like in Ocarina of Time 3D.

The Legend of Zelda: Oracle of Seasons/Ages
In The Legend of Zelda: Oracle of Seasons and The Legend of Zelda: Oracle of Ages, Anti-Fairies look and act as they do in Link's Awakening, and can be defeated with the boomerang. An alternate version of Bubbles called Whisps appear as well, looking and acting like the Bubbles from the first game, but with a static red palette.

The Legend of Zelda: The Wind Waker
In The Legend of Zelda: The Wind Waker, Bubbles lack wings and are surrounded by colored smoke-like fire. They are also much larger than before. The smoke can be removed with the Deku Leaf, which also knocks them to the ground. The red ones first appear in the Tower of the Gods and set Link on fire if touched. The blue ones appear solely in the Earth Temple, and curse Link, which now causes him to not be able to us any items at all as long as he is in the dark, an effect shared with the temple's blue mist.

The Legend of Zelda: Four Swords Adventures
In The Legend of Zelda: Four Swords Adventures, Bubbles resemble their appearance in A Link to the Past, though their fire is heart-shaped. They are invincible, but only appear in the Dark World, with harmless shadows marking their location in the Light World.

The Legend of Zelda: Twilight Princess
In The Legend of Zelda: Twilight Princess, Bubbles first appear in the second half of the Arbiter's Grounds. They sit dormant amongst the generic liftable skulls, but when approached, sprout wings and begin flying. They can be recognized from far away by their distinct inhuman shape, however, and attacked using arrows before they can start flying. The fireless type is considered to be the "normal" Bubble in this game. Fire Bubbles also appear in the Arbiter's Grounds, while Ice Bubbles appear in Snowpeak Ruins.

The Legend of Zelda: Phantom Hourglass
In The Legend of Zelda: Phantom Hourglass, Bubbles again appear in fire and ice varieties, able to burn or freeze Link. They cannot be attacked with anything but arrows unless their respective cover is dispelled by the boomerang, which also takes away their ability to float.

The Legend of Zelda: Spirit Tracks
In The Legend of Zelda: Spirit Tracks, Bubbles are found in the Forest Temple, and are surrounded by a purple cloud. The cloud can be removed with the Whirlwind, rendering them flightless and vulnerable. They are also used as projectiles by Mothulas.

The Legend of Zelda: A Link Between Worlds
In The Legend of Zelda: A Link Between Worlds, Bubbles look and fly around diagonally like the ones from A Link to the Past, but are far less common and instead separated into fire and ice varieties. Once again, their cloud can be removed, this time with the Tornado Rod. Ice Bubbles can also be nullified with the Fire Rod.

Super Smash Bros. for Nintendo 3DS
In Super Smash Bros. for Nintendo 3DS, Bubbles in different colors appear with their Ocarina of Time design as enemies in the Smash Run mode. A mistake in their trophy description claims they also appeared in "Brawl," though this is not the case.