system
Given the following post, respond as if you're commenting on Reddit:
human
[Zelda] Why are so many heroes, born centuries apart from each other and belonging to three separate timelines, pointy-eared blond men who wear green tunics with droopy hats?

*Most* are also left-handed to boot.
gpt
Reincarnation. When Ganon, or another great evil, grows strong, the three Goddesses choose another vessel for the Spirit of the Hero. As a result, the new Hero has all of the common characteristics shared by his predecessors.

It isn't clear if being chosen *gives* the Hero these characteristics, or if the Goddesses choose someone that fits the mold; either is possible.

Zelda, on the other hand, is a direct lineage; each Crown Princess of Hyrule is a daughter of the previous Zelda, and often inherits the Triforce of Wisdom, as well. The original Zelda was mortal incarnation of the Goddess Hylia, and her spirit lives on in each generation.