1-Kid is one of twelve pirates who are referred to as the “Worst Generation”. Sometime during the timeskip, his bounty was raised from 315,000,000 Berries to 470,000,000 Berries.
2-Kid aims to be the most violent pirate out there. He does so as an act of rebellion towards the scum that rule the world. He rules over his crew with evil charisma. Unlike Luffy, when Kid speaks of his experiences in the Grand Line, he mentions killing everyone who dared to laugh at him and his dream to find One Piece and become Pirate King.
3-Kid and Killer are childhood friends. Together they formed the Kid Pirates.
4-Eustass Kid’s surname and name was taken from two real-life pirates. The surname Eustass was taken from 13th century French pirate and mercenary, Eustace the Monk, and the name Kid from 17th century Scottish pirate and privateer, William Kidd, who was also nicknamed “Captain”.
5-In SBS Volume 64, Oda drew the Supernovas as children. Kid is shown with spikier and more spread out hair, 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.
6-After suffering wounds post-timeskip, Kid’s appearance resembles that of Shanks in that both of them have scars running down the left side of their face over their left eye and have both lost their left arms, in addition to both having red hair as well. However, unlike Shanks, Kid’s scars are more extreme, stretching down his chest, and he has also obtained a prosthetic replacement for his missing arm, while Shanks appears to have done nothing to fix his handicap. Fittingly, it was in battle with the Red Hair Pirates that Kid sustained his injuries.
7-Oda drew gender swapped version of Eustass Kid.
8-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.
9-According to Kaido, Kid possesses Conqueror’s Haki just like Luffy.
10-In the 6th Japanese fan poll, Kid ranked 37th, which makes him the second most popular non-Straw Hat Supernova, behind Law. He managed to retain this distinction despite falling 19 places after ranking 18th in the 5th fan poll.