Surume

This kraken is a soft-bodied giant shaped like an octopus, colored orange in the manga and closer to yellow-orange in the anime. Its scale is staggering: it dwarfs the Thousand Sunny so completely that the ship can perch atop its head like a tiny cap, and it outsizes even the giant-scale fish-man Wadatsumi. Where a true octopus has eight limbs and a beaked mouth, Surume sports a beakless, turtle-like head ringed by far more arms, with at least eighteen tentacles visible. His expression shifted over time. He first wore a savage glare, but settled into a gentle, grinning look once Luffy brought him under control.

The first sightings paint him as a terror of the deep, his tentacles strewn with the wreckage of ships he had dragged under, suggesting he devoured the crews along with their vessels. Yet he proved sharp-witted, recognizing real danger when he lunged at Luffy mid-charge during a Gear 3 windup. After being tamed he revealed a far more playful streak, balancing the Sunny on his head and clearly grasping human speech. His dread of his captors, the New Fish-Man Pirates, ran deep because they had torn him out of the North Pole and seized his brothers and entire species hostage. Even so, he trusted Luffy enough to turn on his former captors, and he agonized when threats forced him to attack his friend, relenting only after Luffy vowed to keep his family safe. The fish-men dismissed him as a huge, brainless squid, a judgment colored by their own prejudice.

By force, Hody Jones hauled the beast down from the North Pole to Fish-Man Island and proclaimed it his slave, forcing cooperation by threatening its captive kin. Stationed to guard the Downward Plume, it attacked passing ships, and the Straw Hats ran straight into it on their descent. Luffy, Zoro, and Sanji battled the creature in coating bubbles, and after Luffy landed a Haki-charged Gear 3 blow that knocked it cold, the Monster Trio won it over and named it Surume. The kraken later saved the crew by flattening Wadatsumi, then survived a volcanic eruption alongside them. When Hody ordered it to crush the Straw Hats and later Shirahoshi, Surume sided with Luffy instead, only to be downed by a steroid-boosted Wadatsumi. After the fighting ended, it was tasked with carrying the banished Wadatsumi far out to sea. In later cover stories it parted from Wadatsumi and was glimpsed cheerfully greeting the News Coo reporting Luffy's growing bounty.