Disco

Disco was the owner of the Human Auctioning House at Grove 1 in Sabaody Archipelago.

Personality
He is a brutal person, who abused and kicked Keimi when she was first brought to him.

Sabaody Archipelago Arc
He was responsible for the human auction where the Straw Hats went to save Keimi. He was the one who presented the slaves to the buyers. After all the mess that Luffy and the Straw Hat Pirates made he was seen furious.

When Silvers Rayleigh broke his chains with Haki, he used Haki to knock out the rest of the soldiers in the auction, including Disco.

He was later seen injured (the anime showing it was Shalulia that caused it when Disco was inquiring about payment for Keimi during the chaos), calling the shop's owner, Shichibukai Donquixote Doflamingo for help - but after the latter told him he could have the shop, as Doflamingo wasn't interested in it anymore because the government was calling the Shichibukai to battle against the Whitebeard Pirates, much to Disco's horror.

From the Decks of the World
Two years later, Disco is seen in complete disgrace, living like a vagrant, stabbing the wanted posters of Luffy, Eustass Kid and Trafalgar Law.