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Katsuyuki (克幸) is one of the four hackers who acted as villains 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.
.hack//Legend of the Twilight (anime)
Over the course of the anime it is shown that Katsuyuki is the leader of the four hackers, as he gives orders to them. He is also shown to be smarter than them as he knows how Shugo defeated their monster, and he knows why he or his pals can't find Shugo's parties whereabouts in Mac Anu. When Shugo's party and the Cobalt Knights attacked the hackers base in Naval Monte Katsuyuki and his group summoned a pair of modified monsters to take care of them, however the two monsters were destroyed by Morti before she was summoned by Michi. Katsuyuki then tells his friends to delete everything that could be left as evidence so that no one will track the logs. Katsuyuki along with Hayato and Daisuke then tried to exit the field but like everyone they couldn't because Morti is using a spell to keep them from going anywhere. Finally Katsuyuki, Hayato, and Daisku were all put in comas in the real world along with all the Cobalt Knights except for Kamui, Michi, Shugo, his party. What happened to Katsuyuki and the other male hackers after that is unknown, but it may be that they are banned from playing in The World again after the trouble they had caused.