I know that almost most of the students from China or India.
Is there any benefit for applying MFE program from Taiwan ?(seems like really few people are applying from Taiwan)
Does admission committee consider the diversity of the student body based on their nationality?
I'd say you shouldn't worry about it. You can't control what they think about you coming from whichever country you're from. Even if there's a systematic bias/racism going on, there's nothing we could do about that as an applicant, just strengthen your profile, and apply.