tetra is a tanned "white" girl, her tan represents the freedom she had, the lack of tan represents the guilded cage of female royalty. this theme has been explored before with sheik being zelda's alter ego which she needs to assume in order to be free to do stuff. in older societies, non-tanned skin is associated with upper class status. in most of the oldest cases these are homogenous societies, so it is not inherently about race. it's actually this way in asian countries where everybody is the same ethnicity. it was also that way for europeans before they contacted black people.
in contemporary times where americans have a color based social order with a diverse population, this old social order does become racist even though it was originally classist.
basically the whole world does not revolve around american black/white relations, and the world did not begin 500 years ago. people have been keeping upper class women out of the sun before white people ever enslaved us and have been coming up with ways to divide their populations before they were ever integrated with other ethnic groups. so i would not accuse nintendo of any intentional racism based on this, breh.
these games do in a way display patriarchy and oppression of women since the only free woman capable of being outside doing interesting things is a woman that society doesnt care about (outlaw pirate tetra) or one that people think is actually a man (sheik). in that sense, the worlds of the zelda games all adhere to the dark age european social mores that you would expect a game about fairies, knights with magical swords, and damsels in distress would have.
nintendo games could use some diversifying, but this angle is silly. one way would be to expand the world. they have the gerudo people who are clearly modeled after arabs, they could have link interact with them more, even give him a brown skinned love interest that competes with zelda, LOL. they could even expand it to include fantasy versions of asia, africa, and the americas, but it is clear that hyrule is some kind of fantasy europe.
i think it would be even better if nintendo created a new ip with a darker skinned character. fantasy does not have to adhere to reality, but arbitrary changes to established conventions are not going to be well received.