Joy Boy might not be a giant, Luffy just needs to catch up.
ODA NOTES THE FORGOTTEN TRUTH ABOUT DEVIL FRUITS
Joy Boy's true identity has been a matter of confusion for One Piece fans. Was he a hero or a villain? A mere rebel or a crooked brain? Until Eiichiro Oda clears up the original user of Hito Hito no Mi, things will remain unverified.
However, this has not stopped fans from speculating about Joy Boy. The enigmatic rebel could have been a giant or belonged to another race that ceased to exist. A fan theory tries to figure out the connection between Joy Boy and Luffy.
Joy Boy is often considered to have been a giant. This opinion is reinforced by the presence of the giant straw at Mary Geoise. Even the Iron Robot is a giant mechanism that wakes up to the sound of the Drums of Liberation. Zunesha was also a companion of Nika user. Thus, the fans were of the opinion that Joy Boy was a giant like the inhabitants of Elbaf.
