No, they aren't. The Naruto Hidan novels are usually not considered part of the official canon storyline.
In general, the status of Naruto novels as canon can be a bit ambiguous. Some are closely tied to the main plot and characters, while others might be more like side stories or expansions that don't have a major impact on the core storyline.
It depends. Some Naruto novels are officially recognized as canon and contribute to the overall Naruto story, while others are not.
Yes, they are. The light novels expand on the Naruto universe and are recognized as part of the official canon.
No, they aren't. The Naruto Hiden novels are not considered part of the official canon of the Naruto series.
It depends. Some FF7 novels are officially recognized as canon, while others might be more supplementary or spin-off material.
It depends. Some web novels are regarded as canon if they are officially recognized and tie in closely with the established fictional universe. But many are not.
Not necessarily. It depends on the specific series and the decisions of the creators or the official stance.
Yes, they are. The Borderlands novels are officially recognized as part of the canon of the Borderlands universe.
It depends. Some Warhammer novels are officially recognized as canon within the Warhammer universe, while others might not be.
Yes, they are. The Halo novels are often regarded as part of the official Halo universe and contribute to the overall lore.