As far as cannon goes the movies (save for movie three) have minimal adjustments to the plot despite you being added in.
ROB & DOB will have some changes and so will RTTE but will mostly follow the plot of each respective series
Actual arcs won't be changed it will be the plots of episodes that will be changed lmao
I might add chapters that don't represent episodes idk tho
If i do it's probably relationship development
Gift of the Night fury is cannon in my opinion there will be plot changes to that as well.
Sorry about y'all not kissing yet but y'all will establish a relationship at some point. You have to deal with y'all being dorks for a little while longer.
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Born a Dragon Rider (hiccup x f! reader)
ФанфикY/n has always been Hiccup's best friend. She has also always calmed the dragons around her, yet no one knows why (yet). She is the "sister" of Astrid Hofferson, and she was found at a young age by Alin. However, when Hiccup shoots down a night fury...