About Goro Goro no Mi
The Goro Goro no Mi is a Logia-type Devil Fruit that grants the power to create, control, and become lightning at will, making the user a Lightning Human (雷人間, Kaminari Ningen?); it is one of the few abilities touted as "invincible" according to Nico Robin. The fruit was eaten by Enel.
The Goro Goro no Mi is a round, pear-shaped fruit that tapers off towards the stem, resembling a loquat. Its golden-yellow peel features the overlapping swirl pattern typical of Devil Fruits while forming sharp, jagged outgrowths all over that vary in length, width, and direction, resembling sparks of electricity. Topping the fruit is a green, T-shaped stem that zigzags into a stylized lightning bolt, with one end pointy and the other flat.
The holder of this Logia can create, control, and transform into electricity, effectively becoming lightning incarnate. They can discharge varying amounts of electricity from their body to manipulate as they please, including regulating the voltage: 200 million volts being the maximum output (roughly in the range of natural lightning). Given the sheer destructive power inherent to lightning, this ability seems remarkably strong even by Logia standards and grants overwhelming attack power, as well as high speed and versatility; Nico Robin has mentioned that, among the many existing Devil Fruits, this Logia is one of the few powers that can be considered invincible.