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His father, Yuki Kaito, saw his son's potential and immediately began teaching him the ways of the clan. But as Tatsuya trained in the traditional techniques of the Yuki Clan, he began to access powers beyond even his father's comprehension.
The first power to emerge was the Ice Release (Hyōton), a natural fit given his clan's bloodline. Tatsuya could manipulate ice with a precision that stunned even the most skilled clan members. But it was more than that. His control over ice went beyond anything the Yuki Clan had ever seen. He could freeze entire lakes with a thought, create ice sculptures of immense detail, and even form powerful weapons from the frost around him.
However, as Tatsuya trained, fragments of other abilities began to surface. Memories of his past life merged with the skills of Kuzan from One Piece. He inherited Kuzan's physiology, allowing his body to withstand extreme cold and injury with ease. More than that, Tatsuya began to understand the concept of Haki—the power that allowed one to manifest their willpower into combat techniques. He could sense the presence of others through Observation Haki, strengthen his body with Armament Haki, and even unlock the beginnings of Supreme King Haki—the ability to dominate the wills of others.
But it didn't stop there. From Kuai Liang, Tatsuya learned the deadly arts of hand-to-hand combat, especially the use of ice in martial arts. He could form ice blades in the middle of a strike, freezing his opponents' weapons and limbs in the blink of an eye. Kuai Liang's knowledge of stealth, assassination, and battle tactics filtered into his mind, enhancing his already sharp instincts.
Esdeath's power added another layer of strategy to his arsenal. Her knowledge of military tactics, battlefield control, and ice manipulation in massive quantities began to surface. While still young, Tatsuya could feel the potential to dominate armies, much like Esdeath herself had done in her own world.
From Iceman, Tatsuya gained the understanding of molecular manipulation, the ability to control ice down to its smallest particles. This was a power that would take years to fully unlock, but he already felt its presence lurking within him. The ability to become one with ice, to transcend physical limitations, was his to explore. As a result, by the age of 7, the MC was already at Jōnin level in terms of Chakra and Ninjutsu.
At seven years old, Tatsuya's strength was already far beyond his peers. However, he knew that to fully unlock his potential, he needed to train his body to handle the immense power that was gradually unsealing.
His training plan was grueling. He focused on three main areas: strength, speed, and control.
Strength Training: Using techniques from the Rokushiki martial art style, inherited from Kuzan, Tatsuya began training his body to its absolute limits. Rokushiki consisted of six fundamental techniques—Soru for speed, Geppo for mid-air movement, Tekkai for defense, Shigan for finger-based strikes, Rankyaku for slicing airwaves, and Rokuogan, a devastating shockwave attack. By mastering Rokushiki, he strengthened his body to levels that rivaled the greatest shinobi in history.
Speed Training: Through the use of Soru and Observation Haki, Tatsuya trained to move at blinding speeds, surpassing even the most agile shinobi. His perception of time in combat became so refined that he could dodge attacks before they happened, a trait that made him nearly impossible to catch.
Control: The most difficult aspect of his training was learning to control the vast power within him. The immense cold of Ice Release, combined with the intricate techniques of Kuai Liang and Esdeath, required perfect harmony. He trained with his father, sparring daily, learning how to temper his power and avoid unnecessary destruction.
As Tatsuya grew stronger, his father, Yuki Kaito, noticed the uniqueness of his son's techniques. Tatsuya wasn't just powerful—his combat style was unlike anything the Yuki Clan had ever seen. The martial arts, the raw power, the icy techniques—it was a perfect balance of grace and devastation. Kaito soon realized that Tatsuya's skills were far beyond what the clan could offer him, and instead, Tatsuya began teaching.
Due to the physiology of the One Piece world being different from that of Naruto's world, Tatsuya had to make the Rokushiki adaptable to the Naruto world. This meant that the Rokushiki had to allow its user to reproduce or replicate their powers with chakra. With his knowledge and monstrous genius, Tatsuya was eventually able to make the Rokushiki martial art style adaptable to chakra. He then passed down the Rokushiki adaptation techniques to his father and some key members of the clan, turning them into a formidable fighting force.