I’m just trying to help you figure out how you can approach this by asking the following.

Do you go through extensive efforts to make sure the reader knows that your characters are white, black, latin, etc etc? Does it add to their character depth? Was it important for yourself and the reader to know their ethnicity for your story?

Or do you imagine that readers get an interpretation of characters race because of how you provide their background, like where they grew up and their cultural customs…or do you assume people would associate the character with the most populated ethnicity in your area of your country?

Unless the fact that they physically appear “asian” has an impact on the plot, character relationships and such, why not just describe them how you would describe any other character?

It would perhaps be easier for you to do this if your character comes from another place in your specific fantasy environment. Like they’re from another culture. Then you can focus on the aura around the character. Like how they move (speed they move, dynamic ba minimalistic movements), their mannerism, the way they speak (volume, not the pitch, from my personal experience I speak more from my mouth when I speak in my native Japanese, and more from throat in English…but I still speak much softer than average English speaker), their habits with eye contact, how they sit. They could wear different types of colors than others, different fitting clothes.

If your character isn’t from elsewhere, and you want to give the character a sense of otherness or uniqueness compared to the general demographic you describe… you could do it by focusing on the general atmosphere and the presence they give off. Just don’t get too stereotypical in the way you describe it.

This approach would be probably trickier. What I might recommend off top of my head is to try reading some translations of isekai light novels, particularly ones where Asian woman protagonist ends up in European setting. Mainly because there seems to be a lot of them these days. Maybe reading it from reverse perspective would help you think of new ideas?