I dont think thats as much of an issue as youre making it out to be (no offense). Most of the characters from the video game era that Link originated in didnt have personalities. Mario didnt back then. Samus Aran didnt (hell, you didnt even realize she was female until the very end). Simon and Trevor Belmont didnt. And at least in the case of that last example, the Castlevania Netflix series proved that a personality could be crafted for him that really works and resonates with people.