Canon and non canon

[(Phantom) Thief]

Innocent Call, Last Recode , and Ragtime are canon. And Returner occurs in between Vol. 3 & Vol. 4. However like with Sora at the end of .hack//Unison we have't received an explanation as what was really happening with the character just yet.

[Kuukai]

The guidebooks/Link have explained both as wandering AIs at this point. In Sora's case it was more of a duplicate, in Ovan's case it was a Tsukasa-like situation.