Katasuke Tono

**Katasuke Tōno** (遠野カタスケ, *Tōno Katasuke*) is a tokubetsu jōnin of Konohagakure's Scientific Ninja Weapons Team.

## Background

After the Fourth Great Shinobi War, Katasuke headed up an effort to help all surviving war causalities recover from their maiming injuries. He would often visit and pester Naruto Uzumaki, the Seventh Hokage, for approval on various new projects, ultimately getting well-acquainted with the Hokage's family. He developed an advanced form of prosthetics that would allow people to return to normal life. One of his patients was Ao. At some point, he learned of Chamaru's injury and contacted Akita Inuzuka to tell her that he'd make the ninken a prosthetic limb. Upon doing so, the dog made a full recovery, and Akita became his assistant.

Boruto would often visit Katasuke's lab when he was feeling upset, hoping to see impressive new ninja tools to brighten his mood. Katasuke made a habit of having special edition games around for Boruto to play, and often gave him advice about life to help him feel better.

## Personality

Katasuke is an eccentric and optimistic individual with prodigious intelligence and imagination. Scientifically, he is easily one of the most brilliant minds in Konoha, constantly inventing new innovated and sophisticated tools with the Scientific Ninja Tool team. Talented a scientist as he is, he is humble enough to admit to his own limitations and likewise open to accept help from others, showing true interest to see what Amado Sanzu's own talents could do for his research. He likewise becomes inspired to work harder at the sight of other people's scientific accomplishments. He is highly passionate about his work, always eager to test the limits of his works. This sometimes can lead him into odd situations, such as when he attempted to develop a device that could make the user intangible, and ended up running into a wall. Even in events like these, he is shown to be consistently in high spirits, always looking at things from a positive mental attitude. His grand goal in life is to modernise ninjutsu to the point that it can be beneficial and used by anyone to better everyday life. He is also shown to be an avid gamer, as he enjoys playing video games and works to complete them with a passion; he typically owns special edition games, which he lends Boruto, whom he respectfully calls "Young Lord".

Katasuke's personality was changed after an encounter with an agent of the organisation Kara. A side-effect of his genjutsu exposure made him became incredibly selfish, arrogant, and manipulative, using Boruto to test his new invention in the Chūnin Exams even when it had been explicitly forbidden by the Hokage. When his misdeeds were exposed, he was utterly remorseless, shamelessly using the opportunity to flaunt his genius to the assembled crowds. After he was interrupted by the arrival of Momoshiki Ōtsutsuki, Katasuke was shown to be vengeful and reckless, following the special team which was going to confront the invader, and attempting to finish him off himself in retaliation.

After the mission, Kara's control over him was broken and he reverted back to his normal self. He demonstrated great responsibility, eager to help his fellow Konoha-nin when the situation calls for it and deeply ashamed that, even if by genjutsu, he acted so recklessly and allowed his research to fall into enemy hands. His sense of duty also made him willing to sacrifice himself as a diversion to atone for his mistakes. Feeling such shame at how his research was perverted into such weapons of destruction, he came to regret creating it at all. However, Boruto reminded him that a tool is good or bad depending on how it is used, as Katasuke only used his inventions to protect and heal, reaffirming his faith in his research.