Akihide Karatsu (Japanese: 唐津明秀 [Karatsu Akihide]) is one of the overarching protagonists for Ready Player One and is a friend of Daito and a Gunter who embarked upon Halliday's Easter Egg Hunt alongside Daito. In the movie, his real name is Xo, a Chinese American.
He was portrayed by Philip Zhao and voiced by Daniel Wu.