I personally think that this series can be divided into two main lines.
The first line is the growth line of Hiccup and Toothless. Hiccup is intelligent, persistent, peace-loving, infectious and persuasive, and he is a natural leader. Having been with one man and one dragon for ten years, Hiccup finds his own way in adventures and becomes the leader of his own. Toothless also grew wiser and stronger, and eventually became the Dragon King. Speaking of this, I can't help but want to sigh, the growth story of the teenager is really warm and cruel, and he is loved and lost at the same time.
The second line is the relationship between humans and dragons, from hostility to guardian symbiosis to separation. Different from the premise of the coexistence conditions of the first two parts, the third part begins to reflect the contradiction between human and dragon symbiosis - the increasing dragon clan brings trouble to the life of the islanders, and it is difficult for the islanders to ensure the safety of the dragon clan under the eyes of outsiders. To borrow a sentence from the Dragon Slayer, "Human's wisdom has always been above other creatures, and trying to coexist will lead to human extinction." From another perspective, I personally can't accept the ending of the "domestication" of the dragon family.
Whether it is the need for the two protagonists to become the head of the family, the need for the head of a clan, or the fact that Vikings and Dragons are not as good as each other, it is destined that the ending of the third part will leave some regrets. But one person and one dragon went from "as one" solidarity to independence, taking on the responsibility of family and leader (Dragon King), this process is really warm and tearful.
"Even if you love each other, you will be separated. That's how life is, but, there's no better gift than love."
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