Eustass Valve

Eustass Valve was the captain of the Steam Pipe Pirates. He served as the secondary antagonist of the first saga and the primary villain in Ragnar's backstory, being the man who raided his village and took his family. He was defeated and killed by the Devil's Luck Pirates in Episode 8: "The Throne Room Battle". He is also the self-proclaimed father of Eustass Kid in the main series. Kid was only a baby when Valve was killed by the Devil's Luck Pirates.

Appearance
Eustass Valve is an average-sized man. He has bright red hair, pale white skin and purple lipstick. He's normally well-dressed in steam punk garb. He's donned a top hat covered with gears and pipes, the outer rim shadowing over his green tinted goggles. Valve wears a flowing brown coat covered in gears, acting as light armor. Steam flows off his body, rapidly being produced by his unknown power. This could be inspired by Luffy's Gear Second ability.

Personality
Eustass Valve is a very energetic person. He often spoke too fast to articulate his words properly.

Eustass Valve claims to value two things above all else: money and chaos. This explains his history with slave trading and pillaging. However, Eustass Valve is also shown to adore his alleged newborn son, perhaps more than either of the aforementioned desires combined.

He seems to enjoy battle and general cruelty. He stated that he loves to be hated and he clearly enjoys being considered evil. He actively participated in slave trading while he was the captain of the Steam Pipe Pirates.

Overview
Eustass Valve has several steam based abilities, playing off the steam punk aesthetic of his crew. It is likely that this is due to some sort of steam based Devil Fruit.

Named Attacks
Steam Burst: Blasts of steam are shot from Eustass Valve's skin. This attack is normally used at long range but it was attempted point-blank on Duros.

Steam Rocket: Eustass Valve was able to use steam to propel himself to evade attacks or for increased movement.

Speed Manipulation: An ability similar to Gear Second, Eustass Valve can power himself up in order to gain tremendous energy and speed. This also multiplied his damage so much, he was shown to attack Ragnar and Duros four times in a single turn.

Eustass Kid
Eustass Valve is the self-proclaimed father of actual One Piece character: Eustass Kid. Valve loved his alleged baby son immensely, and regretted dying while he was still young. He had confidence that Kid would become a great pirate.

Ragnar
Eustass Valve raided Ragnar's home village while he was away. He and his pirate crew also took members of the village, including Ragnar's wife and son, to sell into slavery.

History
Eustass Valve's childhood is an unknown. He became a pirate at some point in his life and immediately began causing chaos and amassing wealth. At some point during his career as a pirate he claims to have fathered a little boy named Eustass Kid.

He, officially the captain of the Steam Pipe Pirates, raided several villages. One such village was Ragnar's home town. Eustass Valve destroyed the village for fun and sold its members as slaves to the Tarako Kingdom.

He maintained good relations with the Tarako Kingdom, until one day he attempted an assassination on the current King Malachite's life. He was defeated in the throne room at the hands of the Devil's Luck Pirates. Valve's death was grizzly as he was ripped to pieces and had his head stomped to mush by Ragnar.

Trivia

 * Asides from mentions of Gol D. Roger, Eustass Valve was the first One Piece D&D character to ever reference someone who existed in canon.
 * Valve died with a smile on his face
 * If he was the actual father of Kid, then he would be the 4th father of a supernova to be revealed.