Jack

Jack is a pirate captain who has ties to the Underworld.

Appearance
Not much is known about Jack, besides the fact that he wears some kind of metal jaw or helmet, bearing a slight resemblance to Morgan's or Jean Ango's. He also seems to have bloodshot eyes.

Personality
Jack appears to be very headstrong and reckless, deciding to attack four Marine ships at once carrying powerful Marines to rescue Doflamingo, showing also great confidence in his power.

He is also rather sadistic, not being above torturing enemies in order to get what he wants.

Kaido
Jack seems to be allied with Kaido as his ship bears Kaido's Jolly Roger.

Donquixote Doflamingo
Jack also appears to be allied with Doflamingo as he was seen planning to retrieve the former Shichibukai from the Marine convoy carrying him.

Abilities and Powers
Being a pirate captain, Jack has authority over the members of his crew.

Jack was capable of destroying an entire town of Mink Tribe by himself, leaving large claw marks in his wake. He was able to sink two of the four Marine battleships that were part of Donquixote Doflamingo's convoy, but was eventually no match for the entire fleet carrying Fujitora and Sengoku.

Punk Hazard Arc
He was briefly mentioned being notified of Caesar Clown's capture from viewers of Caesar's broadcast of the Punk Hazard incident.

Dressrosa Arc
In his first physical appearance, he was tailing Marine Ships that were escorting Donquixote Doflamingo to Impel Down. Despite warnings that powerful Marines were guarding him, Jack refused to leave and prepared to attack the Marine ships.

Zou Arc
About a week before Luffy and Law's arrival at Zou, Jack attacked a town in Mokomo Dukedom and left it in ruins. He tortured locals, questioning them about something that he was after.

Jack was reported to have been killed by the Marines who were escorting Doflamingo. However, his death remained unconfirmed.

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