Onigashima

Onigashima is a New World island and a region of Wano Country, which serves as the official residence of the Yonko Kaido, the All-Stars and Numbers.

Layout and Locations
Onigashima appears to be a Winter Island, with snow constantly falling. The landscape is dotted with bonsai-like trees.

Skull-Shaped Land-Mass


The most notable landmark of Onigashima is a large rock formation resembling a skull with horns. This mountain appears to have multiple buildings or rectangular rocks on and around it, and is easily visible from a great distance.

Kaido's Residence


Kaido resides in a giant mansion somewhere on the island. Although it has yet to be shown in full, the mansion appears to occupy a considerable portion of the island, being large enough to house the abnormally large top ranking members of the Beasts Pirates. Inside the mansion is a cell which was once occupied by Eustass Kid.

Past
According to Kin'emon, Minatomo built Kaido's residence.

Dressrosa Arc
X Drake and some other Beasts Pirates were outside Kaido's lair on Onigashima when they received news of Joker's defeat, which they tried shouting out to Kaido, unaware that he had gone to the Ballon Terminal.

Zou Arc
Sometime later, Kaido returned to his lair and received a call from Scratchmen Apoo, telling him they lost contact with Jack. Realizing his plans to take back Doflamingo had failed, Kaido drank a lot and suffered from intense mood swings, including a rage that caused him to hit some of his subordinates through the roof of his lair.

Levely Arc
Kaido received a call from Big Mom, who told him she would be coming to his territory to kill Luffy despite his adamant refusal.

Wano Country Arc
Back at Onigashima, Jack was scolded by fellow All-Stars King and Queen because the offerings from the Kuri region had been decreasing lately.

After Queen captured Big Mom and brought her to Onigashima, Kaido and Big Mom met face to face and the two clashed until they decided to form an alliance to conquer the world. Around this time, the Numbers also return alongside Scratchmen Apoo to Onigashima for the Fire Festival.

Trivia

 * The island shares its name with an island in the Japanese folktale of Momotarō, where the titular hero and his animal retainers went to defeat the residing demons that were troubling people, similar to how the Ninja-Pirate-Mink-Samurai Alliance plans to take down Kaido, who was oppressing the people of Wano Country.

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