So I just reread the “Hiccup: The viking who was seasick” book and since there aren’t any contradictions with the movie universe I always considered as canon in the movie universe. I mean we don’t have a lot of Information about movieHiccup’s childhood so i have a lot of headcanons related to the book:
1. Hiccup being a very frightened kid. Especially of spiders, thunder and sudeen loud noises. I imagine him still being a little scared of these things when he’s older. He tries to hide it from the other riders but i doesn’t take the twins a long time to notice his reaction when a spider near him, to Hiccup ’s cost.
2. Hiccup wearing these shoes when he was little. Idk but I love these shoes for little Hiccup
3. Even though he most of the time is a really shy, polite kid, Hiccup already has the smart, sassy traits he later has in the movies.
4. Stoick doing push ups before breakfast. This is seriously my favourite headcanon.
5. Hiccup is seasick. I’ve already seen a lot of posts and headcanons about that, but i can easily imagine as well that Hiccup is seasick and just hates riding boats but has no problem flying Toothless.
6. Stoick being Stoick but still a great Dad for little Hiccup (just like we’ve seen in the flashbacks in Httyd 3)
