One Piece: Raijin

Asa left the residential area and retreated to the forest on the other side of Birka Island.

Having stolen a fruit from Enel and given him another in return, Asa felt no guilt. In fact, he considered it a righteous act of charity. Now, unburdened by distractions, he could devote himself fully to his training in the secluded forest.

Daily physical exercise was non-negotiable. Asa pumped his fists, channeling all his strength into each punch. The resulting shockwaves sent dead leaves and branches scattering across the ground.

Sweat poured from his body, soaking his clothes, but he paid it no mind. Immersed in the euphoria of his growing power, he ignored the discomfort entirely.

"My Thunder Fruit abilities are still in their infancy," he thought. "To continue growing stronger, I need to polish my skills. But is there a faster way to improve?"

Even as he trained, his mind raced with ideas. The physical exertion wasn't enough to distract him from exploring new possibilities.

Suddenly, an idea struck him.

"Electric current can stimulate musculoskeletal cells and accelerate their growth. Could I use my abilities to strengthen my body?"

Asa's eyes lit up with excitement. The concept seemed plausible.

He recalled the anime Naruto, where Raikage used lightning-based techniques to enhance his physical strength. The idea of adapting such a method for his Thunder Fruit abilities thrilled him.

"If this works," he mused, "I could one day rival even Kaido and Whitebeard!"

However, Asa also understood the risks. Such a method was inherently dangerous and could lead to fatal consequences if miscalculated. The Raikage's techniques were likely the product of generations of experimentation and refinement. Asa, on the other hand, had no such lineage to guide him.

But unlike Raikage, Asa could precisely control lightning. This gave him a significant advantage in experimenting with such a method.

The risks were high, but Asa was undeterred. As someone who wielded lightning, he could control its intensity and immediately stop if anything went wrong.

"The Thunder Fruit even has a technique like electrotherapy, which can restart a stopped heart. If Enel could develop such an ability, why couldn't I use electricity to strengthen my body?"

Asa sat down and began his experiment, carefully focusing his lightning to avoid entering an elemental state.

For safety, he decided to start small. Instead of targeting his entire body, Asa concentrated the current on his left pinky finger, isolating it to prevent the electricity from spreading.

"If I lose a finger, it's not a big deal," he reasoned. "But damaging my organs would be a death sentence."

Bit by bit, Asa increased the current, carefully monitoring the changes in his pinky finger.

One Month Later

"It worked!" Asa exclaimed, almost leaping off the thick tree branch where he was perched.

After a month of testing, the results were undeniable. His left pinky finger was noticeably stronger and more flexible than its counterpart. The success filled him with excitement and confidence.

"Finally, I can safely use electricity to strengthen my body. Kaido's title as the strongest creature in the sea, land, and air will soon belong to me!" Asa declared with a triumphant grin.

The process hadn't been without its challenges. At one point, an accidental surge of electricity had nearly reduced his pinky to ash. Fortunately, Asa's ability to transform into lightning had saved him from permanent damage.

With the experiment now proven, Asa began applying the technique to his entire body. He directed currents to flow through his muscles, bones, and skin, strengthening them incrementally. However, he avoided his internal organs for now, as any mistake could be fatal.

The sensation was both strange and exhilarating. Asa's body tingled as the electricity coursed through him, causing involuntary shivers.

"This feels even better than soaking in a hot spring," he thought, allowing himself to relax and enjoy the process.

Over time, Asa noticed significant improvements. His skin grew tougher, his muscles denser, and his bones stronger. Though the changes were gradual, they were undoubtedly transformative.

In the solitude of the forest, Asa honed his body, fully immersed in his training.

PS: Power Stones you unwashed peasants