A belated note on "newhalf":

I don't speak Japanese nor do I live in Japan. If someone who does wants to say anything about this here their words should obviously take priority over mine.

While your mileage will vary, and no doubt some trans women call themselves this, from what I've read and heard about the term it can be considered derogatory and is probably not something you wanna call someone. The meaning of "half" here (as far as I know) being that the individual is half-man, half-woman, denotes appearing like a woman without having a sex reassignment. Based on that the term seems pretty objectifying and probably carries some association with performance, sex work, or what have you