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.

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 by himself, leaving large claw marks in his wake.

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.

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