Gomu Gomu no Mi/Gear 5 Techniques

I can do everything I wanted to do!! I think I can fight a bit longer... My heartbeat sounds so funny!! This is the pinnacle of what I can do!! This is... Gear 5!!!

Gear 5 ("Gear Fifth") is a technique created as a result of Luffy awakening his Devil Fruit. It was first seen during Luffy's third battle with Kaidou on the Onigashima rooftop.

Overview


The awakening of the Gomu Gomu no Mi, also known as the Hito Hito no Mi, Model: Nika, grants the user's rubber-like body increased strength and freedom, limited only by the user's imagination. It is for this reason that the user is said to become the "embodiment of freedom", able to bring joy to the people around them and making it "the most ridiculous power in the world". One of the most notable features of the awakened form is granting cartoon-like effects, not only to the user, but also to their opponent, an example being eye-popping effects, and cartoonish welts after a head injury; also, while in this state, the user displays a grand state of elation and confidence.



In this state, Luffy is able to utilize both the limb inflation of Gear 3 and the muscle inflation of Gear 4 without the need to pump air into his body first, which he first used against Kaidou. He was able to increase his arm to an enormous size in order to grab Kaidou's transformed body and yank him up out of the Skull Dome. With his enlarged limbs and muscles, Luffy could easily manhandle Kaidou despite his enormous size, swinging him from side to side.

Luffy's rubbery nature can be extended into the environment around him, as seen when Luffy stretched a section of roof and used it to bounce Kaidou's Boro Breath back at him. Interestingly, the altered terrain, while elastic, was neither burnt nor melted by the Boro Breath, even though the attack was shown to be scorching hot and had enough explosive power to destroy a castle and a mountain top.

In this state, Luffy's heartbeat takes on a musical rhythm which has been described by Zunesha as the "Drums of Liberation" (解放のドラム).

Trivia

 * Gear 5 seems to take inspiration from rubber hose animation and various cartoon effects.
 * Gear 5 was first hinted at in SBS Volume 98, when a fan asked if it was coming and Oda responded by surreptitiously noting that the world was in the process of transitioning to 5G broadband networks.