Masked Deuce is an alias used by the first member of Ace's pirate crew, the Spade Pirates, usually referred to as just "Deuce" or "Deu". He abandoned his real name, which remains unknown, but is known to have come from a prominent East Blue family of medical professionals. Despite nominally being the head of the crew besides Ace, Deuce could struggle being respected by the crew, often relying on Skull and Mihar. Currently a Whitebeard pirate after the spade pirates merged into Whitebeard’s crew.