Mr. Mellow

Mr. Mellow is one of the only identified members of the Baroque Works Billions. He is somewhat leader of at least some Billions and orders an unsuccessful attack on Portgas D. Ace and oversaw the murder of Mr. 11. He is responsible for bringing Dance Powder into Arabasta, causing its people to rebel against the king by lying it was being ordered by the king to bring Dance Powder into Arabasta.

Trivia

 * Between the two appearances of the character there is difference in the text written in his T-shirt. On Volume 18 page 117-118 in Vivi’s flashback in his T-shirt is written the word "Half-Boiled" [半熟] but in now is written the word "Full-Boiled" [完熟]. A fan asked Oda on SBS about this and Oda answered that "He has matured".