One Piece Odyssee

Jack is a giant grouper fish-man of massive stature, dwarfing his crewmates. Unlike the majority of fish-men, his pale skin is identical to that of a human, making it easy to mistake him for one. While still being immensely muscular, Jack's limbs are disproportionately small when compared to his enormous torso. He wears a metallic jaw mask that seemingly disappears when he transforms into his mammoth form, and has a pair of horns on each side of his head. His blond hair is worn in a ponytail and a pair of long braids. He wears a light brown sleeveless feathery coat with spiked pauldrons on his shoulders, circled by a belt bearing his crew's Jolly Roger. He has a veined forehead. He has two piercings in his right ear, and wears spiked pauldrons on his shoulders. He carries a pair of tusks around his neck which are actually sheathes containing his scythe-like blades. His mouth contains puffed lips and pointed teeth like some fish-man

Jack is violent and short-tempered. His ruthlessness extends to even attacking children and the elderly. He has even admitted that he has a love for causing destruction, even when there is no real benefit to it. Those who have witnessed Jack's personality in person describe these traits as madness. He is also extremely sadistic, willing to torture enemies in order to get what he wants. He is barbaric and brutal to the point of hacking off limbs and creating terrible bloodshed, only ceasing his carnage when he has more urgent matters to attend to.