Curly Dadan

Dadan is Monkey D. Garp's friend. Garp entrusted him to take care of Portgas D. Ace shortly after the boy's birth. Later, Garp also left his grandson Luffy in Dadan's care. In Strong World ch 0, it shows Makino stating that Garp 'went to the mountain', as she grew up in Fuschia Village, Dadan is also a resident on the same island. Though Dadan is shown to be angry when Ace nearly killed people who offended his heritage, Ace did seem to like him.

In ch547, pg 11 as Ace was dying says to Luffy "If you ever...happen to run across Dadan...could you tell him goodbye for me?", thus settling one question, what is Dadan's gender. Fron Ace's comment, it's clear that Dadan is male.

Trivia

 * Beyond the name and role as Ace and Luffy's caretaker, virtually nothing is known about who Dadan is. As such, he/she is the center of myths among fans.
 * In Yellow Databook, Dadan's name appears alongside in Dragon's biography.
 * The mayor of Luffy's hometown, Woop Slap, knows about him/her, as he states "Does Dadan know!?"
 * Just before he dies, Ace asks Luffy to tell Dadan "goodbye" for him.