Katsumi Ōmori

In the humble shipyards of Water 7, amidst the clatter of hammers and the scent of sawdust, a girl named Katsumi Ōmori was born with a mind as vast and disorganized as the Grand Line itself. Her parents were brilliant shipwrights, known for their ability to design and build vessels that could withstand the most ferocious storms. But Katsumi wasn't interested in the predictable world of blueprints and keels. From a young age, her attention was captivated by the chaotic, swirling patterns of the ocean currents and the nonsensical, intricate details of ancient, half-eaten maps. Her early years were a series of fortunate accidents. While other children learned to read and write, Katsumi was dissecting the internal workings of old pumps and sketching incredibly detailed maps of places that didn't exist, complete with sea serpents made of macaroni and islands shaped like her father's hammer. Her parents, though confused, indulged her peculiar interests. They'd often find her staring blankly at a complex piece of machinery, only for her to suddenly announce the exact flaw in its design—a flaw she'd fix with a piece of driftwood and a rusty nail. Her mind was a whirlwind of genius and profound misunderstanding. She could reverse-engineer a complex steam engine but couldn't grasp why someone would use a fork to eat soup. This unique blend of genius and naiveté made her an outcast. She found solace in the quiet solitude of the shipyard's junkyard, a place she called her "thought garden." It was here that she discovered the remnants of a ship, a vessel that had been lost and found and lost again, a ship that, according to the sailors' tales, had sailed through the mythical Calm Belt and back. The stories of this ship ignited a strange fire in her mind. It wasn't the adventure she craved, but the incomprehensible logic of a ship that defied the laws of the sea. She spent years meticulously piecing together the broken fragments, not to rebuild the ship, but to understand its impossible journey. One day, while staring at a seemingly random piece of the ship's rudder, she had an epiphany. The rudder wasn't just a rudder; it was a key. A key to a map. A map to a treasure. But not a treasure of gold or jewels. It was a treasure of knowledge. A place where the lines between reality and imagination blurred, a place where the "incomprehensible" became the norm. It was a map that only she could understand. The day she finally set sail was an accident, of course. She was testing a self-invented "gravity sail" on a small dinghy when a freak gust of wind caught her, hurtling her out of Water 7 and onto the open sea. It was a stroke of fate that she was found by the Straw Hat Pirates, a crew as bizarre and chaotic as her own mind. When a storm hit, threatening to tear their ship apart, she, with a blank look on her face, used her strange knowledge to reroute the ship by calculating the exact angle of the wind and the currents, saving them all. And that's how Katsumi Ōmori joined the Straw Hat crew. She joined them not for the promise of adventure or treasure, but because their nonsensical journey was the only thing that made sense to her. She found a family in Luffy's carefree spirit, a challenge in Zoro's stoic strength, and endless, unintended comedy in Sanji's incessant flirting, which she always misinterpreted as a strange form of hospitality. And she, the girl who understood nothing, became the one person everyone could talk to, a silent confidant with a brilliant mind and a heart as vast and open as the Grand Line she now sailed.