A word used by those who write fanfiction. It refers to a idea, storyline, or pairing ect. that was not promoted in the original work the fanfiction was based on. Antonym of canon.
The fanfiction’s plot was so non-canon that readers could hardly make a connection between it and the original work.
non-canon: define #2
Something not accepted by the original creator or it being a spin off
Super sayain 4(Non canon)