|Japanese Voice||Taisuke Yamamoto|
|English Voice||Jerry Gelb|
|First Appearance||.hack//Legend of the Twilight|
Katsuyuki is one of the four hackers who acted as villians during the anime version of 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.