He is one of twelve pirates who are referred to as the "Worst Generation" (formerly known as the "Eleven Supernovas"). One of the reasons his bounty was higher than Luffy's when they arrived at the Archipelago was a result of him and his crew causing huge numbers of civilian casualties in the course of their activities. Sometime during the timeskip, his bounty was raised from Beli315,000,000 to Beli470,000,000.
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He wears a pair of studded, square shaped goggles on his forehead, and a large fur captain's coat over his bare muscular torso. The dark brown coat is adorned with spikes on its shoulders lined in maroon. The collar of the coat is extremely flared and wide. He typically wears this coat with his right arm in its sleeve and his left arm under the coat itself.
As a child, his hair was spikier and more spread out, similar to a lion's mane. He also wore larger and rounder goggles and did not have dark lips. He was depicted tinkering with a toy robot with a wrench. His blue sleeveless shirt has a sewn patch, like his pants which are striped yellow, and has a patch.
After the timeskip, he is shown with slightly longer hair that appears to be pushed back. He also has a large scar that drags from the left side of his forehead, goes down his neck and another smaller one that goes through his left eye. There are two parallel scars on his lower right arm also. His left arm also appears to be entirely mechanical indicating that he lost his arm during the two year timeskip, as well as somehow connected to his nervous system, shown by the presence of several metallic wires embedded directly into his skin. His attire consists of his trademark spotted pants, a black opened vest, held down by a belted war kilt. He also has a long dark red coat, worn over his shoulders. He appears to have become more muscular and also has scars on his right forearm, left pectoral, and on the left side of his abdomen. He no longer wears any impractical jewelry.
Eustass Kid is notorious for causing huge amounts of civilian casualties. He is generally either angry or making sarcastic jokes. When he feels that he is being insulted, he is quick to resort to violence, as shown when he attacks Scratchmen Apoo, for apparently staring at him. He is quite sensitive to being mocked, insulted or glanced at. He also seems to be cruel even when not provoked, as he crucified another defeated pirate crew just because he deemed them too weak to roam around in the New World. Kid is fearless and has a penchant for violence. According to Baron Tamago, after the timeskip when Kid was roaming around in the New World, he destroyed two ships belonging to Yonko Big Mom's allies. This shows how fearless he is and does not hesitate to challenge a Yonko who is at the same level as Whitebeard. Despite his violent nature, he knows how to restrain himself when in a precarious situation.
Kid is also shown to be quite cynical about the World Government. He is not blind to the way the World Nobles act, remarking that compared to them pirates are almost humane in nature and that they at least have charming sides and do not hesitate to be honest about their faults, unlike the Nobles, who justify their abuses with their heritages granted by their ancestors. He decides to leave the auction house after Keimi is bought for Beli500,000,000 by a World Noble, commenting that it was like a metaphor for this screwed up world and calling the whole affair a farce. He similarly notes that the charade was over when the broadcast of Portgas D. Ace's execution was cut off.
Kid has the same dream as Luffy: to find One Piece and become the new Pirate King. Because of this, and Luffy's recklessness, he seems to have a great deal of respect for him. However, while they often encounter the same problems, Kid deals with them in his own way, apparently slaughtering anyone and everyone who ever laughed at his ambition, in some ways being an antithesis to Luffy. He also seems to believe that possessing the determination to achieve the impossible is necessary to survive in the New World. Kid wants to keep up-to-date with the events of the New World. Despite not being a broker, he watched the broadcast of Caesar Clown's experiment just to be informed.
As the captain of the Kid Pirates, Eustass Kid has complete authority over the crew. During the timeskip the Kid Pirates continued to rise in infamy, as evidenced by Kid and Killer's bounties increasing, and their willingness to attack Big Mom's ships. Prior to the timeskip Kid and his crew were known for dealing major destruction and civilian casualties along their route through the Grand Line and towards the New World. Kid is a fearsome pirate who, along with the rest of his crew, showed flawless resistance to the Haki pulse emitted by Silvers Rayleigh at the Human Auctioning House and effortlessly defeated a large group of marines alongside Luffy and Law. He along with his crew also managed to escape from Admiral Kizaru's attack.
After the timeskip, he seems to have become much more bold, if not more powerful, as he destroyed two ships belonging to Big Mom's allies despite her being a Yonko. His bounty also rose to Beli 470,000,000.
Kid also appears well connected, as he is aware of dealings within the underworld.
Kid possesses a Devil Fruit power connected to magnetism. This manifests in two different abilities, both depicting repulsion and attraction of metals within his vicinity to be used as weapons. The first allows him to repel metallic objects away from himself, such as reflecting a Marine cannonball back towards its shooter. The second ability allows him to draw metallic objects towards him and form them into objects, his most frequent use of this being to form a giant arm made of hundreds of metallic weapons and objects and connecting it to his right hand. When forming this metallic arm, he can use it to punch his opponents, or as a makeshift shield to block even a Pacifista's laser beams. It is unknown if the firearms connected to his metal arm can fire at his will or not. In the anime and Unlimited Cruise game, Kid can also launch compressed bullets of scrap metal at his opponent at high speed. When using his Devil Fruit ability, purple electrical sparks emit from his hands, so his ability may resemble an electromagnet.
The main weakness of the fruit seems to be its dependence from the surrounding environment, which must contain metal in order for the fruit's powers to be used (though this weakness has yet to be exploited). Other than that, it is also weak against the standard Devil Fruit weaknesses.