Momoo

Mohmoo (モーム, Mōmu) is a giant "sea cow" (literally) that was brought from the Grand Line by Arlong's crew.

Arlong Arc
It was Mohmoo that destroyed Gosa Village. However, when he encountered Monkey D. Luffy, Sanji, and Yosaku's boat, he is promptly beaten and used to tow their boat to the island. Later, during the battle at Arlong Park, he is called upon by Hatchan (his caregiver) to fight the Straw Hat Pirates. Despite memories of his first defeat, he does as he is told, only to be used in the Gomu Gomu no Kazaguruma, where Luffy spun Mohmoo around the area, taking out most of Arlong's forces, and then Mohmoo himself was thrown out of Arlong Park and in the process being knocked unconscious.

Two Years Later
Sometime after the events at Arlong Park, he was captured by the Caribou Brothers. They use him as a means of advanced sea navigation. After bashing into Luffy's ship, Mohmoo recognizes Nami, Sanji, and Luffy. He gets scared and runs away, leaving one of the Caribou brothers on Luffy's ship.

Trivia

 * While Mohmoo resembles a Sea King, he is actually just a giant sea dwelling mammal.

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