Original Name: モーム
Romaji Name: Mōmu
Nicknames: Giant Sea Cow
Series: One Piece
Age: Unknown
Weight: 16 tons (32,000 lbs)
Height: 36 meters (118 feet)
Date of Birth: Unknown
Blood Type: Unknown


Mohmoo is a gentle and docile creature, despite his massive size. It is portrayed as somewhat fearful, as it was easily intimidated by Luffy and the Straw Hats. However, when ordered by Hatchan, Mohmoo obediently fought against the Straw Hats, suggesting that he is loyal to those he trusts.


Mohmoo is a giant “sea cow” brought from the Grand Line by Arlong’s crew. It was Mohmoo who destroyed the village of Gosa on Arlong’s orders. Later, Mohmoo was used by Hatchan to fight the Straw Hats in Arlong Park, but was easily defeated by Luffy’s Gomu Gomu no Kazaguruma attack.

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Mohmoo is a huge sea creature, standing 36 meters tall and weighing 16 tons. It has a seal-like structure with fish-like scales, and its body is mostly bluish-grey in color.


As a giant sea creature, Mohmoo possesses immense physical strength and endurance. It could easily destroy an entire village and survived being thrown out of Arlong Park by Luffy’s attack. However, it was ultimately defeated by the Straw Hats, suggesting that its abilities are limited compared to more powerful enemies.


Mohmoo is a character from the One Piece universe created by Eiichiro Oda. He first appeared in the Arlong Park arc, where he played a supporting role in the conflict between the Straw Hats and Arlong’s crew.

Mohmoo – FAQ

Here are 6-8 FAQs about Mohmoo from “One Piece”:

What is Mohmoo?

Mohmoo is a massive, docile sea cow that first appears in the Arlong Park arc of the One Piece anime and manga series. He is a gentle giant who was forced to serve under the Fishman Pirate Arlong.

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Where does Mohmoo come from?

Mohmoo is originally from Fishman Island, the underwater home of the Fishman and Merman races in the One Piece world. He was captured by Arlong and brought to the surface to serve as a mount and transport for his pirate crew.

What is Mohmoo’s role in the story?

Mohmoo is used by Arlong and his crew to move quickly across the ocean, carrying them and their ship. He is also used to intimidate and attack the people of Cocoyasi Village. Mohmoo is defeated when Monkey D. Luffy knocks him out, weakening Arlong’s forces.

Does Mohmoo have any special powers?

As a sea cow, Mohmoo has incredible strength and endurance, allowing it to easily carry Arlong’s large ship across the ocean. It also has a thick, durable hide that allows it to withstand attacks. However, Mohmoo is not a naturally aggressive creature and is mostly used by Arlong as a means of transportation.

What happens to Mohmoo after the arc in Arlong Park?

After Arlong’s defeat, Mohmoo flees the scene and is not seen again in the main One Piece story. His current whereabouts and fate are unknown, though he probably returned to Fishman Island or continued to roam the seas.

Is Mohmoo an important character in One Piece?

While Mohmoo is a memorable and visually distinctive character, he plays a relatively minor role in the overall One Piece story. He serves as a plot device to show Arlong’s power and the Fishman’s control over the seas, but does not have much character development or significance beyond that. Mohmoo is more of a supporting character than a central figure in the story.