Kraken (クラーケン Kurāken?) is a massive, boneless, octopus-like creature several hundred times larger than the Thousand Sunny. Unlike a regular octopus, it has a turtle-like head without a beak between the arms. It is also known as the "Monster of the Arctic" (北極の怪物 Hokkyoku no Kaibutsu?). The only seen example of a Kraken is Surume, who was introduced in Chapter 604. Hody Jones went all the way to the North Pole to kidnap Surume for his uses, due to its fearsome power, he only managed to keep it under control by holding its brothers as hostage.
In Norse mythology, the Kraken is said to have dragged dozens of sailing vessels down into the ocean to devour its crew. Indeed, when the Straw Hats first encounter one on their way to Fishman Island, several crushed pirate ships can be seen between its massive tentacles, indicating that it feeds on the ships and crew it pulls down into the ocean. Caribou recites a story about it, calling it "the enemy of the human race" and that it "never knows satisfaction where killing is concerned". He found it odd that one would be living near the Red Line. Hody also mentioned that, as a legendary creature, a Kraken can be sold for a high price, even if dead. It is unknown if these tales of its ruthlessness are true, as the one encountered by the Straw Hats was entirely pleasant once they befriended him, its possible his violent actions before were done merely at Hody's whim.
The Sea Lion (海獅子 Umi Jishi?) is a sea monster that lives in the depths of the ocean. One was seen in the New Fishman Pirates' army of sea monsters just outside Fishman Island in Chapter 607, which was later ridden by the Flying Pirates during their attack at Ryugu Kingdom. It may be based on the merlion, a mythical creature with the head of a lion and the body of a fish. It is a visual pun on real-life "sea lions".
The Sea Bear (海熊 Umi Guma?) is a sea creature that lives on the ocean floor. The only one seen is under the command of the New Fishman Pirates, and it appeared first alongside the Sea Lion and many other sea beasts under the crew's command in Chapter 607. It was on a rampage, but stopped when some fishmen tried to frighten it with fire. The kanji for sea bear can mean "fur seal" in Chinese, which the sea bear somewhat resembles.
Sea Rhinoceros, Sea Gorilla, Sea Elephant, Sea Giraffe
The Sea Rhinoceros (海サイ Umi Sai?), Sea Gorilla (海ゴリラ Umi Gorira?), Sea Giraffe (海キリン Umi Kirin?), and Sea Elephant (海ゾウ Umi Zō?) are sea monsters that live in the depths of the ocean. They were seen as the New Fishman Pirates' army of sea monsters just outside Fishman Island
in Chapter 607, and were later ridden by the Flying Pirates during their attack on Ryugu Kingdom.. The sea elephant is a visual pun on real-life "sea elephants".
Sea Turtle Elevator
The Sea Turtle Elevator (ウミガメエレベーター Umigame Erebētā?) is a large turtle that has been tamed by the people of Fishman Island. It is used by the people (though most likely mainly by humans) to ferry them from the lower levels of the coral Mansions to the surface and back again. The turtle's shell is large enough for several average-sized humans to stand on comfortably and has a bubble covering it which holds air for humans to breath.
Fish Taxi and Fish Bus
The Fish Taxi (お魚タクシー Osakana Takushī?) is a large fish able to hover over land, thanks to a coating bubble, and swim in the sea and is used as transportation to cross both terrains. The coating bubble is on it's back, with seats aligning it's dorsal fin. It also wears a hat. There is also the Fish Bus (お魚バス Osakana Basu?).
The long flounder (長ヒラメ Naga Hirame?) is a species of fish which has been trained and employed by the Ryugu Palace. Like a normal flounder, it is very flat, with both it's eyes on the dorsal side, and it's mouth on the opposite. However, as it's name suggests, it is very long like an eel. Furthermore, it is large enough to carry several people on one side. After applying a coating bubble to the dorsal side, it is used as a platform to hold air-breathing humans while hosting events and parties in an underwater environment.
Technically, most of the "animals" on Punk Hazard are not actual beings belonging to a particular species. Rather, due to the intervention of Vegapunk, Caesar Clown, or Trafalgar Law, they are either an artificially created being or hybridized version of the species they represent.
The Straw Hat Pirates encountered a Dragon (竜（ドラゴン） Doragon?) on the first island they visit in the New World, Punk Hazard. The dragon was capable of breathing fire, possessed immense strength and extremely durable and hot skin, and with its massive wings, was capable of flight. After a brief battle with the Straw Hats, it was decapitated by Zoro.
Later, Monet stated that the dragon belonged to Dr. Vegapunk and according to Brownbeard, it was artificially made to protect Punk Hazard and it was capable of adapting to any weather environment. One of the World Nobles took a liking to the dragon and gave it a name.
Slime (スライム Suraimu?) is a massive gelatinous creature that seems to be under the control of Caesar Clown. It appears to have no true shape or limbs, though it does seem to possess eyes and a mouth. The creature seems to have no trouble with intense heat as it was seen traversing the Fire Lands, touching the burning earth without any signs of negative effects. It is capable of "shooting" gas that seems to suffocate its victims. It was contained in the Fire Lands of Punk Hazard before Caesar decided to use it to get rid of the Straw Hat Pirates and the G-5 Marines.
- ↑ One Piece Manga — Vol. 62 Chapter 606 , Van der Decken calls the Kraken "Monster of the Arctic".
- ↑ 2.0 2.1 One Piece Manga — Vol. 64 Chapter 636 , Hody threatens to kill Surume's brothers if he disobeys any further, and threatens to sell him, dead or alive, for a high price.
- ↑ 3.0 3.1 3.2 One Piece Manga — Vol. 62 Chapter 607 , a Sea Lion appears.
- ↑ 4.0 4.1 One Piece Manga — Vol. 63 Chapter 616 , Decken and the Flying Pirates rode on the Sea Lion.
- ↑ One Piece Manga — Vol. 64 Chapter 630 , the New Fishman Pirates calm the Sea Bear down.
- ↑ One Piece Manga — Vol. 66 Chapter 655 , A dragon appears on Punk Hazard.
- ↑ One Piece Manga — Vol. 66 Chapter 656 , Luff and Zoro vs. the Dragon of Punk Hazard.
- ↑ One Piece Manga — Vol. 67 Chapter 664 .