Some probaly are and some clearly are not, like the comedic ones like DD Hokuto no Ken.

Well some are clearly contradicting to the main story, like the Raoh or Jagi ones. That's why I was unsure if they were canon.

If it contradicts Hokuto no Ken or Souten no Ken, those parts are not canon.

You mean the scenes that contradict HnK aren't canon, or the gaiden as a whole isn't canon?

Well, I would say that those scenes are not. But if possible it's best to keep info from the gaidens in a separate from the canon, like in Kokuoh's page, so people know where the info came from.

I see. Well thanks for the informationl