Katasuke Tōno

is a jōnin from Konohagakure who appears in Boruto: Naruto the Movie. He works for Konoha's Science Ninja Weapons Team.

Appearance
Katasuke has a short crop of brown hair and brown eyes. He also wears a pair of glasses. In every day duties, he wears a complete white scientist suit and not wearing forehead protector. In battle, he wear a complete standard Konohagakure jōnin uniform, however, rather than standard red arm band depicting Uzushiogakure crest, he wears white arm band depicting Science Ninja Weapons Team crest.

Boruto: Naruto The Movie
As a scientist, he invents a forearm device that stores and releases ninjutsu at the user's will. He wanted to introduce it at the Chūnin Exams but Naruto Uzumaki considered it to be a form of cheating and forbade it. However, unbeknownst to Naruto, Katasuke gives the device to Boruto Uzumaki to use in the Chūnin Exams, in the hopes of gaining publicity for his invention. Once Naruto discovers this and disqualifies Boruto for cheating, Katasuke tries to announce to the audience that there was no point in using traditional ninjutsu techniques due to how far advanced their technology is before Momoshiki and Kinshiki attacked the arena. Katasuke joins the rescue mission to rescue Naruto from the two enemies. After Naruto and Sasuke Uchiha defeated Momoshiki, Katasuke rushed in an attempt to finish off the enemy with his device. However he inadvertently restored Momoshiki's strength as the latter was able to absorb the attacks Katasuke fired at him.