Franky is one of the Straw Hat crew members who has contributed greatly. He had built a new ship after the Straw Hat crew lost the Going Merry in the Water Seven arc. We know the new ship as the Thousand Sunny or Sunny Go. The ship is made of mustika adam wood, which is the same material as Roger’s Oro Jackson ship.
Before meeting the Straw Hat crew, Franky was the leader of the Franky Family group. Franky has always been obsessed with the figure of Tom, a famous carpenter and shipbuilder who is Franky’s role model. Tom is also the only person who cares about Franky and makes him his successor. Franky himself is a human who has several artificial body parts, which we later know as a cyborg.
The front part of his body truly protects his life, because it is resistant to various attacks. However, unfortunately, Franky’s backside is still fragile. With this cyborg body, Franky keeps many weapons that he uses to fight against enemies. What’s interesting is that Franky’s body has undergone several improvements so far in One Piece.
Actually, how Franky became a cyborg happened by accident. After a terrible incident occurred, namely when he tried to stop the sea train, The Puffing Tom, Franky’s body was finally destroyed. Because there was no other choice, he finally chose to make himself a cyborg by adding many robot parts as replacements for his badly injured limbs.
At that time, Franky used various leftover materials that he could find. How Franky became a cyborg and where he got the ability to transform himself into a cyborg is still not known for certain. However, his ability as a ship expert is thought to be the reason Franky was able to modify his own body. Gorosei Saturn himself admitted in the last chapter that Franky was one of the strong Straw Hat crew members who was able to save Luffy’s life.