Eustass "Captain" Kid is a notorious pirate from South Blue and the captain of the Kid Pirates. 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. Kid is a pale, tall, muscular man with bright red hair, resembling flames. His nose has a particular shape, being quite pointed and having little protrusions on both sides. He has dark reddish purple colored fingernails, red/orange eyes and no eyebrows.
He dresses in an extravagant attire consisting of black and yellow lizard-print pants with a red fringe, motorcycle boots, and a blue sash under a green belt fastened by a large circular buckle with a four-leaf clover-like pattern in the middle. He also has a slim bandolier, also with minuscule bolts that go diagonally over his right shoulder then ties to his waist, where he keeps a dagger with a Japanese-style hilt and what appears to be a flintlock gun. He also has gold bangles around both wrists. 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.