Xin

Xin was allegedly the President/Chairman of China in 2073, though his actual existence cannot be confirmed as the original GNN transcripts mentioning him have been modified by American soldiers.

Behind the scenes
The literal translation of the Chinese term for President of the PRC is 中华人民共和国主席: Chairman of the People's Republic of China (technically, Chairperson). Fallout 3 explicitly names Chairman Cheng as holding this post. Given that the GNN transcript is notorious for the amount of outright errors contained within, this is a deliberate retcon. Xin never existed insofar the series is concerned.

Appearances
Xin is mentioned only in Fallout 2.