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Katsuyuki (克幸) is one of the four hackers who acted as villians during the anime version of .hack//Legend of the Twilight.
Katsuyuki is a Blademaster, he appears as a young long-haired boy wearing platemail. His wave symbol is composed of two small tattoos on his face.
While he might look innocent, Katsuyuki is an accomplished hacker. He can be quite vicious and will not hesitate to destroy those who provoke him using one of the Data Bugs under his control.
In the real world Katsuyuki is a young boy, his age is unknown but it is probably around 10-12. He spends most of his time with his accomplices Hayato, Michi, and Daisuke. He is also able to contact the Vagrant AI Morti, though he seems to avoid her when possible.
Over the course of the anime it is show that Katsuyuki is the leader of the four hackers, as he gives orders to them. He is also show to be smarter than them as he know how Shugo defeated their monster, and how he knows why he or his pals can't find Shugo's parties where abouts in Mac Anu. When Shugo's party and the Cobalt Knights found them in a field Katsuyuki an his group summoned a pair of modified monsters to take care of them.