My son is 50/50 Thai / English.
We live in Thailand and he is accepted as 100% Thai.
I admit that I’ll never be accepted as Thai but that comes with benefits as well as drawbacks.
It’s generally easier on the kids in Thailand, I think, because mixed race couples are more widely accepted there than in Japan/China/Korea.
I did a few years teaching ESL in Seoul and out of hundred kids, there were just two siblings that were mixed race - Korean mom and American Dad.
Even though these two kids looked basically Korean (except their hair was dark brown instead of black) and spoke fluent Korean, I was shocked that some of the other kids in the class referred to them as 외국인 (foreigners), the exact same word they used to refer to me as white man.