Bari

Baris, originally localized as Onoffs, are large jellyfish capable of charging their bodies with electricity. Additionally, they can sometimes float through the air or split into smaller jellyfish called Biris.

The Legend of Zelda: A Link to the Past
In The Legend of Zelda: A Link to the Past, Onoffs appear primarily in Dark World dungeons, though they can also be found in a cave at Hyrule's Death Mountain. They float around, periodically stopping to emit electricity. They come in two colors, being blue, which is defeated automatically after taking enough damage, and red, which splits into two Biris.

In the Temple of the Four Sword found in the Game Boy Advance enhanced port, dark green Baris replace blue ones, acting the same but being more durable and immune to damage from the Hookshot, which simply pulls them. Along with being found floating freely, they cover the new version of Arrghus, replacing its typical Arrghi. These ones do not zap until after being removed with the Hookshot.

The Legend of Zelda: Ocarina of Time
In The Legend of Zelda: Ocarina of Time, Baris appear alongside Biris solely inside Jabu-Jabu's Belly as parasites to Lord Jabu-Jabu, where Baris are the less common of the two. They have been redesigned with a pair of club-like tentacles, a pair of fangs, and round internal nuclei, giving them a somewhat -like appearance. Both Baris and Biris are constantly charged in this appearance, and as such cannot be directly attacked until the boomerang is obtained. Baris fall from the ceiling in certain areas before rising from the floor while spinning their tentacles. Upon defeat, Baris split into three Biris. The boss of the dungeon, an enormous, parasitic, electrical anemone placed there by Ganondorf named Barinade seems to be their leader and directly controls several large, Bari-like jellyfish during its battle.

The Legend of Zelda: Oracle of Ages
In The Legend of Zelda: Oracle of Ages, Baris are again exclusive to Jabu-Jabu's Belly, though they now solely appear underwater. They resemble their appearance in A Link to the Past in both appearance and behavior and are all blue, though they split into two Biris upon defeat. The boss of the dungeon is a giant Bari called Plasmarine.

The Legend of Zelda: Twilight Princess
In The Legend of Zelda: Twilight Princess, Baris are tall with long tentacles and muffin-shaped bells and only appear in the Lakebed Temple. They again only appear underwater, where they float in place and periodically charge with electricity. They can be defeated by using the Clawshot on them when they are not charging, thus removing the nucleus from the bell. Biris are absent from this appearance.

The Legend of Zelda: A Link Between Worlds
In The Legend of Zelda: A Link Between Worlds, Baris look and act as they do in A Link to the Past, though the blue ones are now a dark turquoise. Additionally, stronger variants also appear, with a light gray type replacing the turquoise ones and a yellow type replacing the red ones in latter appearances. Giant Baris called Gigabaris appear as minibosses in yellow and purple, splitting into fifteen Biris upon defeat.