The Dragon's Boy, Quite Literally

This is a How to Train Your Dragon fanfic taking place after the first movie, and closer to the Netflix series which seems to be taking place before the second movie for... character reasons...

Hiccup and Toothless are out flying (as per usual), when something flashes into Hiccup's mind. That night he's plagued with a nightmare and wakes up feeling as if the shores of Berk were screaming at him to investigate. The moment he lands on the beach he finds a shipwreck and throughout all the wreckage he finds the boy from his nightmare, bleeding, and barely alive. Who is this boy? How did he get here? Why does he have such a deep connection with dragons? What secrets does he hide? And why in the Archipelago will no dragon allow the boy to ride them?

I know this concept is rather cliche from what I've read about Hiccup meeting a shipwrecked OC and falling in love with them and leaving Astrid as a friend but I hope that the other aspects of this story are unique enough. I could use some help with keeping the characters in character so I hope I can count on my readers to help me with it!

Also credit to whomever made the adorable Hiccup and Toothless drawing.