The Rumble-Rumble Fruit (ランバランバ実, Ranba Ranba Mi) is a Logia-type Cursed Fruit that allows the user to create, control, and transform into electricity at will, making the user an Electric Human (電気人間, Denki Ningen). "Ranba" (ランバ) is from "Ranburu" (ランブル), which is the Japanese pronunciation of the word "Rumble". It was eaten by Eneru. It was mentioned by Nico Robin as one of the fruits with the reputation of being invincible.
Strengths and WeaknessesEdit
The Rumble-Rumble Fruit is considered to be one of the strongest Cursed Fruits. The fruit's major strength, as with other Logia fruits, is that it allows the user to produce, as well as become the element they control. In this case, Eneru is able to produce as well as become electricity. With this in mind, Eneru is able to attack with lightning itself.
He is also able to avoid normal attacks by turning into lightning and allowing the attack to pass through him. On top of that, Eneru can merge with solid matter (like gold or wood) for defense or traveling purposes. Turning into lightning can also have the added effect of electrocuting an opponent. The user is also capable of traveling at a lightning fast speed and instantly reach distant places by turning into pure lightning. The fruit also allows him to jump-start his heart after it stopped.
While seemingly all powerful, its unique weakness is rubber, since it is a natural insulator. This weakness makes the eater of the Gum-Gum Fruit the natural enemy to the fruit's powers due to the user's rubbery body; not only did all of Eneru's electrical attacks have absolutely no effect on Luffy, but Eneru also lost his intangibility against his attacks; this is just as Crocodile lost his intangibility when Luffy was soaked in liquid. It is unknown if other insulators can reproduce the effect that Luffy has on this power. Nami was also able to deflect some of Eneru's lightnings with her Weather Forcer, though Eneru claimed that would stop if he increased the power of the lightnings. Other than that, the user is also affected by the standard Cursed Fruit weaknesses.