As per Oda’s recent interviews, he said a certain professor will explain the complex mechanisms behind all of the Devil Fruits shown in the series. As of now, we aren’t aware of all the types of Devil Fruits that are available in the One Piece world. The Gomu Gomu no Mi is one of the most common types of Devil fruits in the series. This Devil Fruit allows the user’s body to act as a rubber. This is the Devil fruit eaten by Luffy at the beginning of the series. The fruit was introduced to us in the first episode of One Piece. The previous user of this devil fruit most probably was Ace’s mother, Portgas D. Rouge. The reason why I said so is the nature of Ace’s birth. The average birth time takes nine months but Ace’s birth was more than 20 months mark, no other woman could withstand it, except the one with special powers. So she most probably had the devil fruit, Gomu Gomu no Mi Ae in possession, allowing her to bear her child for more than 9 months. As, when Ace was born he was already 11 months old and his weight was more than 20 pounds. One Piece is a popular Japanese manga, the top-selling manga all around the globe up until now. Ever since One Piece aired, no other manga could surpass either the storyline or the sales. The manga is written by Eiichiro Oda. The manga is part of Weekly Shonen Jump since 1997. Here is a popular AMV for the same –