Sometimes, Hiccup's magic is granted to him as a gift or a curse, and he has to learn how to control it. This could involve training and facing inner demons to master the power and use it for good.
In some fanfictions, Hiccup discovers a hidden magical ability and uses it to solve problems or protect his friends and dragons.
Often, Hiccup's magic is tied to his connection with the dragons and helps him communicate with them on a deeper level or enhance their powers. This could lead to exciting adventures and new challenges.