Are the Hiden Novels...

[true enigma]

Canon/Semi Canon?

Matter of opinion on what u consider canon... Its not in the actual manga but Kishi supervised and approved the novel.

In my opinion, its canon because the author approved of this add on as a branch of his story.

 

[Prometheus 2000]

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According to that, the novels are canon since Kishimoto wrote the original story.

It comes down to what you consider canon I guess.

 

[Nick01]

They are Canon like the Last.

This.