But shouldn’t the person of that ethnicity playing that character have the right to chose who they want because they are that ethnicity? I ask this because I went through the process of trying to figure out what’s right and wrong in playing a trans character and a trans rph told me that if you’re not trans, you use a trans fc. But if you are trans you don’t have to — so does that not logic apply to this as well?

I see what you’re saying, but no. Because using cis fcs for trans characters is a way for them to create diversity for themselves, it’s not taking away anyone else’s representation. But using a Korean fc for a Chinese character, while it’s creating more Chinese diversity, is erasing the ethnicity and identity of the Korean person in question. Koreans also do not already have representation and you’re taking away from them by doing so. Plus, please read up on Japanese, Korean and Chinese history.